《周易參同契註(四)》

This passage elucidates the core theory of Daoist alchemy. "Zhou" refers to the eternal and unchanging Dao, while "Yi" represents the principle of transformation. When refining the Great Reverted Elixir, the application of fire phases must follow the celestial cycles (one complete heavenly revolution), hence the term "Zhouyi."

Among the crucial alchemical materials, mercury symbolizes the sun, belonging to the Li Fire of the south (Fire in the Five Phases), representing the Azure Dragon; lead symbolizes the moon, belonging to the Kan Water of the north (Water in the Five Phases), representing the White Tiger. Cinnabar represents the sun, mercury represents the moon, and their combination forms the character "Yi" (易). The term "Can" (参) means to blend—merging three substances (water, earth, and metal) into one, bound together as firmly as a contract, hence the name "Can Tong Qi" (参同契, The Kinship of the Three).

Ancient perfected beings called this scripture the "Dragon-Tiger Superior Classic," where the dragon refers to mercury (an alternate name for mercury) and the tiger refers to lead (also called "Metal Lord"). Red cinnabar is called the Crimson Dragon, while white mercury is called the White Tiger. Later, the Perfected Wei Boyang renamed it "Can Tong Qi," borrowing the framework of the Zhouyi. The Zhouyi discusses relationships such as firmness and yielding, exterior and interior, ruler and minister, father and son, and water and fire—all grounded in the Five Phases. Similarly, the essence of alchemy does not depart from the principles of Yin-Yang and the Five Phases.

This scripture was transmitted by Lingyangzi on Mount Kongtong to Xu Congshi, who then passed it on to Master Chunyu. By observing the hexagrams, Master Chunyu used the cauldron to symbolize Heaven and Earth (Qian and Kun), the medicinal ingredients to symbolize Water and Fire (Kan and Li), the tripod to represent the Great White Star (Saturn), and the furnace to represent the city walls. The remaining sixty hexagrams were used to determine the rising and falling of fire phases and the transformations of Yin-Yang during elixir refinement. The positions of the cauldron had to be adjusted during the winter and summer solstices, which is why the "Five Corresponding Categories" was composed to explain the preceding text.

The scripture consists of three volumes, symbolizing the Three Powers (Heaven, Earth, and Humanity). The cauldron and medicines represent the Three Luminaries (sun, moon, and stars): the first volume discusses the formation of metal and mercury and the cyclical movements of the sun and moon; the second volume explains the increase and decrease of elixir ingredients and the ten-month gestation period (the alchemical cycle); the third volume contains Master Chunyu's supplementary explanations for the first two volumes.

A special note on the meanings of "Qian" and "Kun" in alchemy: Qian refers to the upper lid of the cauldron, while Kun refers to its lower base, just as in the Zhouyi, Qian and Kun are the gateways. Metal and mercury symbolize the sun and moon as medicinal ingredients, while the secret of fire phase application lies in the following: the position of Qian is in the northwest, where Yang resides in a Yin position; the position of Kun is in the southwest, where Yin resides in a Yang position (manifesting the alchemical principle of Yin-Yang intermingling).

This scripture primarily elucidates the principles of Yin-Yang interaction and cauldron operation in alchemical practice. Qian (Yang) and Kun (Yin) function like parents: during the fifth lunar month, a Yin line emerges within the Qian hexagram, while in the eleventh month, a Yang line appears within the Kun hexagram—demonstrating their mutual borrowing. Qian represents fire and Kun symbolizes water, with the two alternating their operations every fifteen days, mirroring the opening and closing of the cauldron's portals.

Qian and Kun are regarded as the parents of the sixty-four hexagrams, just as alchemy requires a cauldron vessel. All things between heaven and earth are generated through the interaction of Yin and Yang Qi (vital energy), hence Qian and Kun are called the primal parents. The Kan hexagram (water) and Li hexagram (fire) form the foundational framework for alchemy: the upper cauldron holds water while the lower contains fire, allowing the medicinal substances (the Golden Male and Cinnabar Mercury) to receive the Qi of water and fire within the vessel. This process resembles operating bellows (tuoyue) to pump air—the hollow interior of the cauldron acts like a flute, with the circulation of fiery Qi producing sound like a flute's note.

These four hexagrams (Qian, Kun, Kan, Li) function like bellows: Qian and Kun represent the cauldron vessel itself, while Kan and Li symbolize the medicinal substances. The cauldron must be tightly sealed with fasteners along its perimeter. The Dao of Yin-Yang manifests when the two medicinal substances (gold and mercury) are compacted beneath golden blossoms within the vessel, forming an airtight seal between upper and lower sections. Qian and Kan belong to Yang, while Kun and Li pertain to Yin—through bellows-like circulation of fiery Qi, the elixir is perfected. The entire process resembles driving a chariot requiring precise rein control, demanding meticulous attunement to the rhythmic interplay of Yin and Yang.

This scripture elucidates the critical control points in the alchemical process, focusing primarily on the operational standards of the cauldron (the alchemical vessel) and the mastery of fire modulation.

During alchemical practice, the cauldron must be firmly secured in the mouth position like a horse's bit, with airtight sealing. Its control should be as steady as holding tight reins, ensuring continuous operation without interruption. The procedure must follow clear principles and rules, just as a wheel must rotate along its axle's trajectory. The "cord" mentioned here refers to the demarcation of the twelve double-hours, where the axle's rotation drives the wheel's movement, requiring smooth and stable operation.

The phrase "governing the external from the center" means: while the cauldron is placed within the furnace and regulated by external fire modulation, the elixir inside the cauldron is simultaneously influenced by the interplay of external water and fire. Thus, the external environment must be firmly stabilized to harmonize the generative and restrictive cycles of water and fire, achieving equilibrium among the four elements (likely referring to metal, wood, water, and fire).

The "chronological cycle" mentioned refers to temporal periods: sixty years constitute one cycle, or sixty hexagrams symbolizing sixty months. In alchemical practice, each day follows a hexagram's guidance for fire modulation, completing one revolution of the Golden Elixir in eleven months. "Five or six monthly nodes" indicates a thirty-day lunar cycle, requiring monthly inspection of the elixir—grinding and returning it to the cauldron—as part of refining the first major elixir.

Operations must strictly align with celestial timing: the modulation of fire at dawn and dusk should correspond with stellar configurations, while the moon's transformative power over all things is influenced by the sun. Therefore, auspicious days must be selected for critical procedures: furnace construction day, mercury processing day, medicinal compounding day, herb pounding day, cauldron sealing day, furnace consecration day, and elixir ingestion day. Particularly, the firing should commence at the midnight hour (子时) during the Shangyuan Festival (a major Daoist observance in the eleventh month). This timing is calculated through Dunjia (遁甲) divination—for instance, the Shangyuan auspicious hour occurs when the winter solstice coincides with a Jiazi day.

Finally, the text emphasizes integrating the principles of the sixty-four hexagrams: according to Dunjia calculations, sixty days correspond to sixty hexagrams, supplemented by the four hexagrams of Qian (Heaven), Kun (Earth), Kan (Water), and Li (Fire), totaling sixty-four hexagrams that map onto the alchemical cycle. Each day employs two hexagrams (beginning with Zhun and Meng), with talismanic commands (cultivation signals) renewed every five days, further subdivided into sixty double-hour periods. The Qian hexagram's strength and Kun hexagram's receptivity represent the rhythmic alternation of Yin-Yang, where the midnight hour (23:00–1:00) marks both the end and beginning of the daily cycle.

This scripture explains the Daoist alchemical method of using the hexagrams from the Book of Changes (Yijing) to regulate the firing process in elixir cultivation.

During the twelve two-hour periods of the day, the period from Si (9-11 AM) to You (5-7 PM) corresponds to the inner refinement stage, while the period from Wu (11 AM-1 PM) to Hai (9-11 PM) corresponds to the outer refinement stage. Yang represents external manifestation, while Yin represents the internal foundation. In alchemical practice, the external vessel must be firm (strong), while the internal medicinal substances must be pliant (soft). These three layers of meaning must be fully integrated.

At the beginning of each lunar month (the new moon), the Zhun hexagram is used to guide the elixir process. The Zhun hexagram consists of Zhen (Thunder) below and Kan (Water) above—Zhen symbolizes the alchemical cauldron, while Kan represents the medicinal substance of mercury. From the Zi period (11 PM-1 AM) to the Wu period, the cauldron should be positioned upright, which is the application of Zhun. The eleventh month corresponds to the Kan hexagram, where the central line is Yang, signifying the sprouting of Yang energy at the peak of Yin. By the fifth month, corresponding to the Li (Fire) hexagram, the central line is Yin, signifying the emergence of Yin energy at the height of Yang.

At night, the Meng hexagram is used to guide the process. The Meng hexagram consists of Gen (Mountain) above and Kan below. From the Wu period to the Zi period, the cauldron should be inverted. Thus, the Zhun hexagram governs the six daytime periods, while the Meng hexagram governs the six nighttime periods, combining to form the imagery of the Yi hexagram (Gen above, Zhen below), symbolizing the cauldron containing the mercury medicine.

Using Zhun and Meng for one day extends to sixty hexagrams over a month, arranged in sequence. Beginning with Zhun, followed by Meng, the second month employs Xu and Song, and so on until the Jiji hexagram, at which point the elixir is complete. This is the sequence of regulating the firing process according to the hexagram lines.

The Jiji hexagram represents water above fire, symbolizing mercury (associated with Kan), which is inherently Yang yet occupies a Yin position, while cinnabar (associated with Li) is inherently Yin yet occupies a Yang position. This interplay of Yin and Yang is precisely the key to successful alchemy.

This passage explains the principles of Yin-Yang transformation in alchemy, primarily using the hexagrams from the "Book of Changes" (Yijing) to illustrate the transformational patterns of alchemical substances (mercury and cinnabar).

The Li hexagram (symbolizing fire) is inherently Yin yet occupies a Yang position, just as mercury (quicksilver) originally belongs to the North (water element) but transforms into cinnabar (fire element) in the South through refinement. The return of northern substances to their southern position represents the "Jiji" hexagram (symbolizing completion), while failure to return constitutes the "Weiji" hexagram (symbolizing incompletion). Mercury, born from cinnabar, belongs to the Li fire but resides in the northern water position, failing to return to its southern fire position—hence the "Weiji" state.

The alchemical process mirrors the lunar cycle, with sixty hexagrams (from Zhun and Meng to Jiji and Weiji) corresponding to a monthly cycle. The waxing and waning from the last day of the month (hui) to the new moon (shuo) embodies the principle of Yin-Yang alternation—where endings return to beginnings. This cyclical pattern repeats throughout the twelve months, such as beginning with the Kun hexagram (pure Yin) in November and concluding with the Fu hexagram (birth of Yang).

In practical application: the twelve earthly branches (shichen) correspond to the celestial circle's 365 degrees, with the twelve lines (six per hexagram) of Zhun and Meng hexagrams mapping to the twelve time periods. Movement and stillness divide between early and late phases: from midnight (zi) to noon (wu) represents active Yang (early phase), while noon to late night (hai) signifies quiescent Yin (late phase), mirroring how spring and summer belong to active Yang while autumn and winter embody quiescent Yin.

Yang Qi movement in spring/summer: Beginning at the winter solstice (eleventh month, zi month) with leftward rotation, Yang Qi peaks at the chen-si positions in the fourth month (eastern inner realm), when mercury achieves complete transformation. Yin Qi movement in autumn/winter: From the summer solstice (fifth month, wu month) to the tenth month (hai month), Yin Qi waxes then wanes (western outer realm), dissipating completely during the xu-hai periods when mercury's nature becomes latent. During the hai-zi period, the water deity (black Kun hexagram) governs while the Qian hexagram (pure Yang) assumes its rightful position—the moment of mercury's complete concealment.

Through twelve months of Yin-Yang interaction—beginning with Qian (pure Yang) and ending with Kun (pure Yin)—the process follows cosmic patterns to ultimately forge the Great Reverted Elixir (the highest Daoist alchemical achievement). This entire operation simulates heaven-earth Yin-Yang fluctuations, achieving fundamental substance transformation through precise control of firing times and celestial rhythms.

This passage explains the method of controlling fire intensity during alchemical practices, requiring adjustments between civil fire (gentle simmering) and martial fire (vigorous heating) in accordance with seasonal changes. Just as nature follows the cycle of spring, summer, autumn and winter, the alchemical process must adapt its firing techniques to these seasonal rhythms.

Spring and summer belong to Yang, demanding martial fire (strong flame) like the brightness of daylight, while autumn and winter belong to Yin, requiring civil fire (gentle flame) akin to the softness of night. In practical operation, charcoal should be added for martial fire after the summer solstice and reduced for civil fire after the winter solstice. This resembles state governance—proper fire control leads to successful elixir formation, while improper handling causes medicinal properties to dissipate.

The positioning of the alchemical cauldron (the vessel) also follows specific principles: the upper lid symbolizes Heaven (Qian), the lower lid represents Earth (Kun), with medicinal substances placed between them. The materials within the vessel mirror the movement of sun and moon—the Kan trigram representing lead (symbolizing the moon) and the Li trigram representing mercury (symbolizing the sun). Their interaction resembles the sun-moon structure of the Chinese character "Yi" (change).

The entire alchemical process must harmonize with the cyclical patterns of the Five Phases (Wood, Fire, Earth, Metal, Water). Just as Yin-Yang energies flow naturally after Heaven and Earth establish their positions, the cauldron's construction embodies the principle of Yin-Yang union. The interlocking of upper and lower lids symbolizes the mating of female and male, manifesting the perfect balance of complementary forces.

This scripture elucidates the principles of furnace positioning and medicinal circulation in alchemical practice. When refining the elixir, one must establish directional orientations on the furnace, rotating Qian (Heaven, Yang) and Kun (Earth, Yin) according to celestial configurations and stellar degrees to determine the positions of Yin-Yang transformations.

The mentioned Kan (Water) and Li (Fire) represent the alchemical medicines: Kan symbolizes the moon with metallic nature, while Li embodies the sun with mercurial properties. Qian and Kun (Heaven and Earth) symbolize the alchemical cauldron and furnace. These four trigrams (Kan, Li, Qian, Kun) differ from the other sixty hexagrams, being exclusively used in elixir refinement. The process requires the mutual interaction of Water and Fire attacking from above and below while rotating the Qian-Kun cauldron-furnace—this constitutes the meaning of "dual application." Mercury within the cauldron requires the dynamic interplay of Water and Fire to ultimately refine the Great Elixir.

As medicinal substances, Kan and Li interact within the Qian-Kun cauldron differently than the other sixty hexagrams. These two medicines are continuously activated by Water and Fire within the cauldron, circulating and alternating through the six directions (east, west, south, north, above, and below)—termed the "six voids." The mercury undergoes repeated transformations: during the twelve two-hour periods of the day, it ascends for six periods and descends for six periods without fixed patterns. From the Zi hour (11pm-1am) to Wu hour (11am-1pm) it descends, then ascends from Wu to Hai hour (9-11pm), with Yin and Yang alternating unpredictably in their upward and downward movements. Deep within the cauldron, the mercury is assaulted by Water and Fire from above while pressured by civil and martial fires (moderate and intense heat) below—through these chaotic transformations, the Great Reverted Elixir is ultimately achieved.

The metal (referring to lead) lies concealed within mercury, the two mutually subduing each other while hidden in the cauldron's depths. The furnace features a balance beam representing the Big Dipper, whose handle rotates monthly and shifts hourly. For instance, when beginning furnace operations at the previous month's end with the handle pointing to the Zi position, it will point to Chou position the following month, progressing sequentially. Precise timing governs fire regulation, and the cauldron's rotations must follow this celestial pattern—the furnace operates like the Dipper in orchestrating creation.

The golden blossoms (alchemical medicine) envelop mercury like a mother embracing her child, while dragon and tiger (Yin-Yang) mutually consume each other, manifesting the Dao's principle. Additionally, materials like earth and golden blossoms are mixed into clay to encase the metallic medicine—these constitute the fundamental guidelines of alchemical practice.

Mercury (Hg) in the alchemical cauldron functions as a vessel encompassing all things. When refined, it becomes the Great Returning Divine Elixir of Purple-Gold Sand. This elixir possesses the power to transform all creation—reviving withered bones into living flesh and turning earth and stone into treasures. When ingested, it enables humans to attain the Dao and achieve perfection, making it the fundamental principle of cultivation.

"Using the formless to control the formed" refers to employing intangible Qi (energy) to govern tangible substances. Yang represents the formless (wu), while Yin represents the formed (you). The Kan trigram symbolizes lead-metal (Kan-metal), and the Li trigram symbolizes mercury (Li-mercury), embodying the alchemical principle of water and fire complementing each other. "Emptiness" is the Dao—the Dao is called formless, yet it gives birth to all things. The intangible Yang Qi, invisible to ordinary people, is called the harmonious Qi of the Void. The tangible Yin Qi tends to stagnate and obstruct. When these two Qi resonate, just as heaven and earth unite to produce wind and rain, the elixir is successfully refined.

Mercury (Hg) belongs to Yang yet contains metallic properties, with metal representing the pure Yang elixir. The combination of mercury and metal is Yin receiving Yang's complement—this is "using the formless to control the formed." Fire also belongs to Yang; metal and mercury are refined through fire control. Though fire appears formless, it can forge tangible elixirs, hence the saying, "Qi's function is emptiness."

"Regulating the fire" refers to adjusting the heat: when Yin wanes and Yang waxes, reduce the charcoal; when Yang waxes and Yin wanes, increase the charcoal. When Yang Qi ascends, raise the alchemical vessel; when Yin Qi descends, lower the vessel.

"Kan and Li vanishing" means the perfect fusion of lead-metal (Kan) and mercury (Li). After the essences of lead (Kan) and mercury (Li) harmonize, their original properties disappear. These theories are not baseless fabrications but grounded in the transformations of Yin-Yang hexagrams (gua xiang) and the natural affinity between metal and mercury.

By observing monthly fire adjustments and verifying them through hexagrams, one can resonate with divine beings and grasp the principles of elixir refinement. The theory behind the Great Returning Elixir involves deducing the transformations of Yin and Yang, drawing on the symbolism of the Kan and Li trigrams, and combining the meaning of the character "Yi" (易)—only when metal and mercury, being of the same kind, interact can the elixir be formed; dissimilar substances cannot validate its efficacy.

The essence of lead symbolizes the moon (Kan belongs to Wu-Earth), while the radiance of mercury symbolizes the sun (Li belongs to Si-Fire). Combining the essences of sun and moon embodies the meaning of "Yi." During the ninth to eleventh lunar months (when Kan-Wu dominates the season), these two supreme treasures are most potent.

This passage elucidates the principles of Yin-Yang interaction and Five Phases coordination in alchemical practice. When Yin Qi reaches its zenith, its essence ascends to form the moon, which in the Five Phases system corresponds to Metal (representing contraction) and Water (representing downward flow). The "gold" mentioned in the scripture refers to the golden flower formed through nine refinements of lead essence, not mundane gold.

If worldly metals like gold and silver are mixed during alchemical preparation, the resulting elixir becomes unfit for consumption. The authentic Golden Elixir (Jindan) can be achieved using only mercury (symbolic of Yang), which constitutes the true divine medicine. Though nine-refined silver-lead essence is mentioned, the lead ultimately transforms into ashes—here the silver's Yin Qi is employed to complement Yang energy.

Yang Qi peaks during the third, fourth, and fifth lunar months when the sun occupies the Li trigram (representing Fire) and the Ji position. The essence of Yang ascends to form the sun, which corresponds to mercury (symbolizing fluidity) and fire (symbolizing heat). Thus the sun-moon alternation manifests Yin-Yang transformation. When the Golden Elixir achieves the union of gold (lead) and mercury, wondrous metamorphosis naturally occurs.

The Yang energy within lead (mercury of the Kan trigram) embodies firmness, while the Yin quality within mercury (lead of the Li trigram) embodies softness—only through this firm-yielding complementarity can the Great Elixir be perfected. Earth (referring to the alchemical crucible) governs seasonal transitions; here it denotes both the vessel and the four yellow minerals. The crucible interior must be coated with yellow earth, for Earth generates Metal. The golden flower and yellow sprout (lead-mercury compounds) are also termed "earth."

The alchemical process must synchronize with lunar phases (from new moon to dark moon). "Interconnected vessels" refer to alchemical equipment requiring a half-inch thick lining of yellow earth mixed with golden flower and yellow sprout compounds. The golden flower constitutes true lead-mercury amalgam, while the yellow sprout derives from calcined red lead.

The Azure Dragon of the East (Wood) represents mercury, the Vermilion Bird of the South (Fire) represents cinnabar, the White Tiger of the West (Metal) represents metallic essence, and the Black Tortoise of the North (Water) represents lead. These four directional substances all submit to the governance of central Earth (Wu-Ji). Though gold and mercury belong to different directions, both rely on the creative power of central Earth. When refining pure Yang elixirs, no realgar is needed—simply pairing mercury with gold through prolonged fiery refinement naturally produces the elixir, provided the crucible is properly coated with yellow earth and golden flower compounds.

This passage explains the principles of mercury-lead reactions and fire regulation in alchemical practice. The ancients believed that when sulfur combined with mercury to form cinnabar (mercury sulfide), sulfur represented the ultimate Yang substance, corresponding to the sun in heaven, while lead and silver corresponded to the moon and were considered the most representative among the seventy-two minerals. Hence, the transformations of lead and mercury were metaphorically described using the imagery of "sun and moon."

The process draws upon the hexagram symbolism from the Zhouyi (Book of Changes): the sun symbolizes cinnabar and mercury, while the moon represents lead and silver. Just as the movement of the sun and moon generates the interplay of Yin and Yang, alchemy must follow the cyclical waxing and waning of these forces. Fire regulation (Shenhuo, or "spirit fire") operates like the transformations of hexagrams—whether Yang wanes while Yin waxes or vice versa, both are achieved through adjusting the intensity of heat. For example, in the eleventh month (corresponding to the Kun hexagram), Yang qi begins to emerge, and by the fifth month (corresponding to the Qian hexagram), Yin qi starts to grow. This rotation of Yin and Yang resembles the thirty spokes of a wheel (symbolizing a month) revolving around a central axis.

There are three specific methods for this process: The first involves opening the cauldron each month to add raw mercury, starting with one liang (about 50 grams) and increasing the amount yearly. After nine cycles (jiuzhuan), the elixir first turns red and then black. It is then crushed, reground, and refined until it finally appears purple. The second method, called the "True Yang Method" (Zhengyangfa), uses equal amounts of lead and mercury. Heating begins at the winter solstice, intensifies at the summer solstice, and completes by the following winter solstice. Each month, the cauldron is opened for observation until the mercury eventually floats atop the lead, forming a purple elixir. The third method adjusts the lead-mercury ratio monthly (referred to as "increasing the dragon and decreasing the tiger," where the dragon symbolizes mercury and the tiger represents lead), adding realgar before refining again.

This passage primarily elaborates on the essential techniques of the "True Yang Method," which simulates the movement of the sun and moon and the cyclical transformation of Yin and Yang to master fire regulation, ultimately producing the Purple Golden Elixir (Zijindan).

The Zhouyi Cantongqi (The Seal of the Unity of the Three) describes the correspondence between alchemical practice and the hexagrams of the Yijing (Book of Changes). The sixty-four hexagrams, with their 384 lines (six lines per hexagram), mirror the 384 zhu (an ancient unit of weight) contained in one jin of alchemical ingredients. The alchemical process unfolds in two stages: first, gentle heating for one day, equivalent to a celestial cycle, followed by intense firing for an entire year before the elixir matures—just as nature’s own "returned elixir" (Golden Elixir) requires the absorption of solar essence (Qi).

Here, the term "fu" (talisman) carries dual meanings: first, the daily and monthly application of two hexagrams—one governing affairs, the other serving as the talisman; second, it refers to alchemical materials like the "five-talisman golden flower," representing the refined essences of heaven and earth, namely gold and mercury. The word "zhe" (to measure) underscores how the Yijing guides alchemy through a precise annual cycle, where controlled firing completes the celestial degrees required for elixir formation.

Elixirs are of two types: the "Unity Elixir" (Can Tong Dan), crafted from half a jin of mercury and half a jin of golden flower over one year; and the "Ninefold Snow-White Elixir," requiring three years, or the "Pure Yang Elixir," refined over fifteen months, with ingredient quantities ranging from hundreds of jin to a single jin.

From the last day of the lunar month (hui) to the new moon (shuo), the pure Yin of Kun (Earth) hexagram transforms into Zhen (Thunder), where the first Yang line emerges. Zhen governs both the talisman and the process. During the twelve two-hour periods (shichen), Yang energy circulates from midnight to noon (zi to si hours), with the firing commencing at the noon hour (wu, specifically the renwu hour). The first day of each month acts like a sealed talisman, marking the decisive moment for alchemical work.

Confucius’s phrase "the harmony of heaven and earth" refers to the critical moment of sealing the alchemical cauldron. Here, "heaven and earth" symbolize the vessel itself, "essence" (jing) denotes the medicinal ingredients, while "sun and moon" represent gold and mercury. These two treasures within the cauldron mirror the celestial dance of sun and moon, refined by solar fire until gold and mercury fuse—just as heavenly Qi descends and earthly Qi rises, their union generating auspicious transformations through Yin-Yang interaction.

When Zhen hexagram arrives to receive the talisman, firm and yielding forces intertwine, and gold-mercury exhales its brilliance like the radiance of sun and moon. Heaven and earth unite their essences to birth all things—so too does the alchemical path follow nature’s law of Yin-Yang mutual generation.

This passage explains the method of refining "lead-mercury reverted elixir" (qian-gong huandan) in Daoist alchemy, whose core principle lies in the harmonious union of Yin and Yang. The "male Yang" refers to mercury (liquid metal), while the "mysterious" denotes lead. When lead is smelted by fire, it liquefies and merges with mercury. As the mercury absorbs the vital essence (Jing-Qi) of lead, it disperses evenly within the molten lead. After cooling, the compound is ground and placed in the alchemical cauldron (Dantian), where further firing transforms it into the great reverted elixir.

The "female Yin" refers to the "Golden Duke" (an alternate name for lead). When lead combines with mercury under intense fire, it produces golden "mysterious-yellow blossoms." These blossoms are melted to encapsulate the mercury before being sealed in the cauldron. During heating, cracking sounds emerge, and fish-scale patterns appear on the surface. When the mercury is fully subdued and the elixir turns purple, the process is complete. If the color remains unripe, refinement must be repeated. Unlike the method recorded in the Golden-Blue Scripture (Jinbi Jing), which uses realgar and orpiment to coat cinnabar, this technique relies solely on lead and mercury as foundational materials.

The text mentions "yellow sprouts" (huangya), which represent the refined essence of lead. During alchemical operations, mercury and lead essence merge chaotically within the cauldron, mirroring the primordial state of heaven and earth at creation—the fundamental principle of inner alchemy (Neidan). The Kun cauldron (symbolizing the alchemical furnace) embodies the womb of all creation, where the elixir's growth parallels the nurturing of life by the Qi of heaven and earth. The so-called "foundation" refers to the base of orpiritic minerals blended with metallic lead for elixir refinement.

The entire process emphasizes Yin-Yang synergy: lead as Yin and mercury as Yang, whose union alone achieves the elixir. While Western regions prized yellow lead (litharge), the Central Plains valued cinnabar (mercury sulfide), yet the supreme "True Yang Unity Divine Elixir" (zhengyang zhenyi shendan) requires only these two treasures. Alchemy mirrors the cultivation of life—mastering firing phases (huohou) and timing to let the medicinal substances transform spontaneously.

This scripture describes the process and principles of refining the Golden Elixir (Jindan).

When gold and mercury (alchemical materials) are refined through a year of controlled firing, they form crystalline structures resembling frost or fish scales. By concentrating the spirit (Shen) through cultivation methods, the physical form of the elixir takes shape. The gold and mercury first liquefy under heat before solidifying, ultimately merging into a single divine elixir. Here, the Yi Jing (Book of Changes) hexagram line "Treading on frost, solid ice will form" (初六履霜坚冰) is cited to illustrate the principle of Yin energy beginning to condense. Therefore, the refinement process should commence during the midnight hour (11 PM–1 AM) on the first full moon of the eleventh lunar month, when Yang energy is newly born. By using fire to control mercury (quicksilver), Yin energy is subdued by Yang, ultimately coalescing into one.

During the eleventh month, as Yang energy first emerges, the Kun hexagram (pure Yin) transforms into the Zhen hexagram (symbolizing thunder and spring), and dormant insects begin to stir—all manifestations of the interplay between Yin and Yang energies. This serves as a metaphor for how mercury, influenced by the fire of the sun and the nascent Yang energy of the firing process, vibrates and seeks to disperse due to the resonance of Yin and Yang. The phrase "the multitude" (众夫) refers to the initial stage of collective alchemical work, where mercury attempts to scatter but is restrained by the controlled fire of the practitioners, much like all movement in the universe originates from the workings of the Dao (the Way). When immortals ingest the Golden Elixir, it transforms them into bodies of golden bones and jade-like flesh—all due to the elixir’s transformative power.

Confucius praised the primordial chaos of heaven and earth’s inception; here, "Qian and Kun" (乾坤) symbolize the alchemical cauldron, while "empty cavern" (洞虚) refers to the preserved firing process within the vessel. Gold and mercury, refined by fire in the vessel, circulate their energies freely.

Tracing back to the era of the Primordial Sovereign (referring to Laozi, the deified Laozi as the supreme deity), this method of refining the divine elixir was established. "The Ospreys" (关雎, from the Book of Songs) here symbolize sealing the mercury (also called the "charming maiden") into the cauldron and refining it gently with mild fire to prevent dispersion. Just as the male and female ospreys call to each other in harmony, mercury and the golden flower (the essence of lead) must cooperate in balance. Without this pairing of opposites, the elixir cannot be completed. Mercury belongs to Yang, while the essence of lead belongs to Yin. Consuming mercury alone is called "solitary Yang," and consuming lead alone is called "solitary Yin." Only when lead and mercury are combined can the elixir be perfected.

This scripture explains the transformative principles of "lead and mercury" (the fundamental materials in alchemy) and the Dao of Yin-Yang harmony in Daoist alchemical practice.

In alchemy, one must use the refined Qi (vital energy) of lead as the foundation, allowing mercury to combine with it and transform into the elixir. Just like the union of husband and wife, mercury represents Yang (the husband), while lead represents Yin (the wife). The fusion of the two requires the application of fire control (the alchemical fire technique). Lead and mercury must undergo repeated refinement (the "seven returns and nine revolutions") before they can become a true elixir.

The specific method is as follows: First, grind lead and mercury into a sandy form, refine them with fire, then add water to form pellets. Place them in a steaming vessel and heat from all sides—the lead will melt and flow out, leaving only the mercury behind. Afterward, place the mixture in a container to nurture it for sixty days until the elixir turns purple. Fire control is crucial during the process; excessive heat will cause the lead and mercury to separate, yielding only lead residue, while proper fire technique ensures their true fusion.

Nowadays, some practitioners do not understand these principles and simply mix cinnabar and lead powder before refining them. As a result, the mercury evaporates, leaving only lead residue. This so-called "elixir," when ingested, will instead cause heaviness in the waist and bodily decline. A true elixir must fully integrate lead and mercury, exhausting the Qi of lead while subduing the nature of mercury. The lead used must also be refined nine times to extract its essence—ordinary white lead will not suffice.

The scripture concludes with a marital metaphor for the alchemical Dao: Mercury (Yang) requires lead (Yin) for harmony, just as a husband needs a wife. Under the influence of proper fire control, the two must tightly unite to forge a genuine elixir. This embodies the fundamental Daoist principle of "the harmonious union of Yin and Yang."

This passage reveals the mysteries of Yin-Yang interaction and fire regulation in alchemical practice. When the two Qi of Yin and Yang (referring to the properties of substances like lead and mercury in alchemy) merge, they generate new vitality, much like the union of husband and wife. The alchemical process follows a sixty-day cycle (called "one yuan"), mirroring the complete rotation of the sixty-year Jiazi cycle. Mercury, after a year of precisely regulated firing and through Yin-Yang interaction, gradually takes form and ultimately coalesces into the Golden Elixir (Jindan).

The control of alchemical fire is exquisitely subtle: adjustments are made every five days, with fifteen days forming one phase, and sixty days completing a grand cycle. Just as the day flows through twelve double-hours, the elixir refinement requires complete Qi circulation. True sages (referring to realized Daoist masters) transmit the Great Dao of the Golden Elixir with absolute authenticity, determining the precise timing of alchemy by observing celestial phenomena (tianfu).

Master Xu (a renowned alchemist) discerned Yin-Yang transformations through hexagram observation: the upper crucible represents Heaven, the lower crucible symbolizes Earth, while the middle space embodies the movement of sun and moon. The entire alchemical vessel constitutes a microcosm—mercury represents the sun, lead embodies the moon, and the vessel itself mirrors the stars. Fire regulation must strictly correspond to lunar phases: from new moon to full moon, gradually increase the fire ("extension"), and from full moon to dark moon, decrease it ("contraction"). In practical terms, add charcoal when Yang Qi first emerges in the eleventh month, and reduce it when Yin Qi strengthens in the fifth month, with adjustments never exceeding three jin.

The cosmic principles described in the Yijing manifest precisely in these advancing and retreating rhythms of alchemical fire. The crucible serves as the cosmic center (tianxin), with lead and mercury's rotation simulating solar and lunar movements. Beginning from the Fu hexagram (symbolizing Yang Qi's birth), the entire alchemical process must strictly adhere to these celestial rhythms until achieving the perfected elixir. Losing this Yin-Yang coordination (sang qi peng) inevitably leads to alchemical failure.

This passage uses the hexagrams of the Yi Jing (Book of Changes) as metaphors for controlling the firing process in alchemy. The Fu hexagram (Earth over Thunder, symbolizing the initial emergence of Yang) represents the moment when the firing begins in the alchemical process, corresponding to the eleventh lunar month. Here, the bottom line of the pure Yin Kun hexagram transforms into a Yang line, forming the Fu hexagram, which signifies the first stirring of Yang energy.

Just as the eldest son inherits his father's legacy in a family, the Zhen hexagram (representing Thunder) – as the eldest "son" of the pure Yang Qian hexagram – emerges from the transformed bottom line of Kun. By the fourth lunar month, this develops into the pure Yang Qian hexagram. The Kun hexagram acts like a mother, providing the foundation for Zhen's growth.

Fire regulation must be as precise as musical tuning. The eleventh month corresponds to the Huangzhong pitch pipe (the first of the ancient twelve pitch standards), when Yang energy first emerges. By the fifth month, corresponding to the Ruibin pitch (the seventh standard), Yang energy begins to recede. Each month has its corresponding hexagram and pitch pipe: the twelfth month pairs the Lin hexagram with the Dalü pitch, the first month matches the Tai hexagram with the Taicu pitch, and so forth. The waning (Xiao) of Yin and waxing (Xi) of Yang proceed in this cyclical manner.

In alchemy, fire control is paramount: excessive heat burns the elixir ingredients, while insufficient heat fails to activate their properties. Thus, the charcoal fire must be adjusted according to the changes in years, months, and days with musical precision. The year is governed by the Qian and Kun hexagrams, their six lines each totaling twelve lines that correspond to the twelve months. Each month divides into two hexagrams governing fifteen days respectively, with each of the twelve daily hours ruled by a specific hexagram. Therefore, fire regulation must strictly follow these temporal cycles.

The ascension and descent processes further align with the movement patterns of the Big Dipper (Dou Shu). This comprehensive system perfectly integrates time division, astronomical observation, and fire regulation, embodying the core Daoist alchemical principle of "correspondence between Heaven and humanity."

This scripture reveals the mysteries of Yin-Yang transformations and fire regulation during alchemical practice, using lunar phases as metaphors for the cyclical control of alchemical firing.

In the neidan (internal alchemy) process, the period from Zi hour (11pm-1am) to Si hour (9-11am) represents the descending phase of Yang qi, when the cauldron's mouth faces downward. From Wu hour (11am-1pm) to Hai hour (9-11pm) marks the ascending phase of Yin qi, with the cauldron's mouth turned upward. This cycle mirrors the moon's movement, requiring the ladle-handle (regulating mechanism) of the alchemical furnace to rotate according to monthly changes. Precise operation depends on controlling the firing according to both monthly cycles and the twelve two-hour periods.

On the third day of the lunar month when the moon appears in the western Geng position (corresponding to the Zhen trigram), Yang qi begins to emerge. The Zhen trigram symbolizes the first stirring of Yang, like the crescent moon on the third day. In alchemical practice: the first day requires Yang fire (intense firing) to initiate transformation in the mercury; the second day sees Yin qi rise as the mercury tends to scatter; the third day brings latent Yang qi that stabilizes the mercury. Through fifteen days of such cyclical alternation, the mercury undergoes repeated scattering and coagulation until reaching full-moon-like perfection on the fifteenth day—though not yet fully stabilized.

On the eighth day when the moon appears in the Ding position (Dui trigram) as the first quarter moon, the Dui trigram's metallic nature manifests. After eight days of firing, the mercury begins blending with metallic substances into liquid form, though incomplete transformation remains.

By the fifteenth day when the full moon shines in the eastern Jia position (Qian trigram), the firing transforms matter from Kun-state to Qian-state. The metals and mercury, after fifteen days of refinement, achieve preliminary solidification like the half-moon's formation. This day's sunrise in the east brings triple-Yang abundance, symbolizing completion.

The text employs the toad (representing lead) and jade rabbit (representing mercury) as metaphors for solar and lunar essences. Just as the moon borrows sunlight to shine, the alchemical mercury—though spiritually marvelous—requires nine refinements and lead combination to achieve the golden elixir (jindan). Like fertilized eggs for hatching or quality seeds for crops, alchemy demands lead as the "seed" to transmute mercury—without which success is impossible. The complete great elixir requires precisely 350 days of regulated firing to accomplish.

This scripture primarily uses the waxing and waning phases of the moon—symbolizing the interplay of Yin and Yang—to metaphorically describe the interaction between alchemical substances (lead and mercury) and the precise regulation of firing times in inner alchemy (Neidan).

Both the "hare" and "toad" mentioned in the text symbolize the moon. Just as the moon doesn't emit its own light but reflects sunlight ("the essence of the sun emits light that shines upon the moon"), in alchemical practice, lead (symbolizing the moon) requires the catalytic action of mercury (symbolizing the sun) to undergo transformation. The mutual interaction between lead and mercury ("lead observes mercury, mercury becomes lead"), when subjected to proper firing techniques, produces radiant essence-light akin to moonlight reflecting solar radiance.

The text meticulously details the moon's monthly cycle from the first to the thirtieth day: on the eighth day ("the eighth day"), the crescent resembles a hare's shape; by the fifteenth ("the fifteenth day"), the full moon appears perfectly round like a toad; from the sixteenth day onward, the moon begins to wane ("the hare's image diminishes"). These phases correspond to distinct stages in alchemical processing, symbolized by the Bagua trigrams: Xun (representing dissipation), Gen (representing cessation), and Kun (representing completion).

Key temporal markers are particularly noted:

• On the sixteenth day when the moon moves to the Xun position (southeast), symbolizing the beginning of the elixir's condensation
• On the twenty-third day during the last quarter moon in the Gen position (northeast), indicating the need to halt the firing process
• On the thirtieth day when the waning moon reaches the Yi position (southwest), marking the completion of an alchemical cycle

These celestial phenomena correspond to the modulation of firing temperatures ("controlled firing") and the transformation of alchemical substances (such as the "formation of fish scales" describing crystalline structures in the elixir). Throughout this process, the natural rhythm of Yang's decline and Yin's growth ("Yang diminishes and breaks," "transforming hardness into softness") constitutes the essential principle determining alchemical success or failure.

This passage explains the application of fire phases (huohou) and the principles of Yin-Yang transformation in alchemical practice. The northeast direction symbolizes the transition between Yin and Yang (from the Gen trigram to the Kun trigram), mirroring the joyful process where lead (representing Yin) and mercury (representing Yang) fuse in the furnace, ultimately forming the elixir. The Lesser Returning Elixir (preliminary stage) can be completed in one month, while the Greater Returning Elixir (advanced stage) requires a full year of precise fire regulation.

The lunar cycle from new moon to full moon corresponds to the waxing and waning of Yin and Yang energies during alchemical refinement. At the end of each month (when the Kun trigram exhausts its phase), new Yang energy emerges again from the Zhen trigram (symbolizing the dragon). This is analogous to the alchemical process of timely adding mercury (the dragon) and reducing lead (the tiger) before returning the mixture to the crucible. Such cyclical renewal mirrors the Fu trigram (with its initial Yang line), repeating endlessly in cosmic rhythm.

The celestial stems Jia (beginning of Yang) and Yi (beginning of Yin) coordinate with Ren (Yang's end) and Gui (Yin's end), representing the proportional relationship between mercury (the azure dragon) and lead (the dark warrior) in the alchemical ingredients. The Qian trigram (pure Yang) and Kun trigram (pure Yin) govern the entire alchemical cycle—whether regulating fire phases by year, month, or day, all must follow this revolving principle of Yin-Yang alternation.

For daily fire regulation: the sum of seven and eight equals fifteen, representing the Yang fire of the waxing moon; nine plus six also makes fifteen, signifying the Yin fire of the waning moon. After completing thirty days of fire phase circulation, the medicinal substances' Yin and Yang energies gradually withdraw and store themselves (latent fire). This monthly rhythm of Yang's recession and Yin's concealment repeats like the moon's phases, embodying nature's fundamental pattern.

This passage elucidates the principles of Yin-Yang transformation and fire regulation in alchemical practice. The number seven represents Lesser Yang (incipient Yang), eight signifies Lesser Yin (incipient Yin), nine denotes Greater Yang (Yang at its zenith), and six stands for Greater Yin (Yin at its peak). These four numbers sum to thirty, symbolizing the waxing and waning of Yin and Yang throughout a lunar cycle.

Just as vegetation withers during midwinter, practitioners must similarly withdraw Yang Qi in accordance with seasonal rhythms, akin to a sovereign retreating into seclusion. The Dao's operation is vast and profoundly mysterious, defying concrete representation. The Eight Trigrams (Qian/Kun/Gen/Dui/Zhen/Xun/Kan/Li) are arranged around the alchemical furnace's eight directions, mapping the celestial patterns governing natural forces. Notably, the Kan trigram (representing Water) contains Yang within Yin, while the Li trigram (representing Fire) holds Yin within Yang, manifesting the mutual containment of these complementary forces.

The alchemical process hinges on mastering the "Primordial Jing" (referring to the quintessence of mercury, the primary ingredient), which embodies the subtle interplay of Heaven's and Earth's energies—so refined as to be nearly imperceptible. Fire regulation must mirror celestial movements with the precision of tracking solar and lunar cycles. The ancient adept Xu Zhenren exemplified this practice by interpreting trigram transformations to guide his alchemical work.

Practically, the furnace incorporates a clepsydra (water clock) marking the twelve two-hour periods. Beginning at the Zi hour (Rat hour), the fire is adjusted hourly with clockwork accuracy. Practitioners must discern auspicious moments through trigram mutations, meticulously synchronizing fire intensity with temporal shifts—never missing the exact transition points between Yin and Yang lines.

The entire process demands celestial precision, requiring practitioners to harmonize their operations with cosmic rhythms through trigram observation and temporal awareness, thereby ensuring the elixir's alignment with natural law.

The year has twelve months, and one must follow the seasonal changes without violating natural laws. Spring nourishes, autumn harvests, summer fosters growth, and winter stores. Excessive Yang energy leads to agitation, while excessive Yin energy breeds deviance. One must consistently adhere to the cyclical patterns of the four seasons.

In alchemical practice, pay attention to the Xun trigram (Wind) before the Geng day and the Gu trigram before the Jia day. The application of firing techniques and the use of vessels must align with the transformations of the Qian (Heaven) and Kun (Earth) trigrams. Alchemy must harmonize with celestial timing, much like observing celestial patterns (the Hetu and Bagua) to grasp the shifts of opportunity.

The selection of an alchemical site is equally crucial. Furnaces and herb gardens should be established in renowned mountains and sacred places, following the lay of the land and the flow of water for auspiciousness. One must also scrutinize alchemical companions, choosing only those with pure intentions and genuine devotion to the Dao.

Alchemy is a matter of cosmic significance involving Heaven, Earth, and humanity: select auspicious days and hours by observing celestial phenomena; choose sites shaded yet sunlit; and seek companions who are gentle and virtuous. The refining of elixirs stirs the divine, and careless site selection may invite mountain spirits to cause mischief. Imbalance between Yin and Yang leads to alchemical failure, and mutual suspicion among companions spells disaster. Like when Duke Zhao of Zhou chose the banks of the Luo River to build the capital, only when celestial timing, terrestrial advantage, and human harmony converge can calamity be avoided.

Movement and stillness in alchemy must follow trigram principles: after the winter and summer solstices, adjust firing techniques according to the Qian and Kun trigrams, with the changing lines determining the intensity of fire. In stillness, reflect on the imagery of the trigram judgments (Tuanci), aligning both active Yang and quiescent Yin with trigram transformations. Just as the Qian trigram enacts benevolence (Ren) and the Kun trigram upholds righteousness (Yi), Heaven and Earth thereby operate in harmony. If rulers and ministers govern by this Dao, the people will naturally dwell in peace and prosperity.

This passage explains the essential operational principles and celestial correspondences in alchemical practice.

The term "御政之首" (yuzheng zhishou) is first interpreted: "御" (yu) means to govern and control, "政" (zheng) refers to regulation, and "首" (shou) signifies the beginning. This indicates that alchemical work must consistently follow natural laws in its operations. Like using a key (管籥 guanyue) to secure subtle points, it ensures the Jing (essence) and Qi (vital energy) do not leak. The specific method involves opening the furnace once each month to adjust the ratio of Dragon (Yang) and Tiger (Yin), rearranging these two treasures (龙虎 longhu) within the alchemical vessel until the elixir is perfected.

The design of key furnace components is highly deliberate: A steelyard beam (魁柄 kuibing) symbolizing the Big Dipper must be installed above the furnace, with its handle positioned to catch dripping water. The handle must rotate monthly to coordinate with the firing process in the cauldron. A long chain (鏁子 suozi) is also used to suspend the crucible in the furnace like a fastened belt—if the mercury (汞 gong) begins to volatilize, the chain's movement signals the need for immediate water immersion to control it. This technique draws from the firm, unyielding nature of western Metal to subdue mercury, requiring strict adherence without error.

Alchemy must harmonize with celestial phenomena: Adjust furnace operations according to the Yin-Yang transformations in hexagram lines (爻象 yaoxiang), and auspicious or ominous signs will manifest. The movements of the five planets (五纬 wuwei) must also correspond—the furnace represents Saturn (镇星 zhenxing), fire corresponds to Mars (荧惑 yinghuo), water aligns with Polaris (北辰 beichen), metallic luster matches Venus (太白 taibai), and mercury relates to Jupiter (岁星 suixing). Seasonal transitions must likewise be observed, otherwise the elixir will fail.

The cycles of twenty-eight lunar mansions (四七 siqi) must also be carefully followed. If the alchemist becomes negligent or indulgent (侈离 chili), the medicinal substances will scatter. "俯仰" (fuyang) refers to the daily flipping of the crucible—fire regulation must strictly follow the twenty-eight mansions' celestial patterns.

Finally, astronomical correspondences are noted: The six Wenchang stars beside the Big Dipper govern six palaces, symbolizing how alchemical practice must obey stellar patterns. The upper part of the crucible corresponds to the Dipper, while the lower part aligns with the Three Steps stars (三钉 sanding). Each component has its governing constellation, with the Wenqu Star (文星 wenxing) serving as primary guide.

This passage explains the governing relationships between elements during alchemical practice. Each stage of alchemy corresponds to the movements of celestial bodies, just as the sun, moon, and stars each have their presiding deities.

In alchemical terminology, the "sun" represents mercury, which embodies the quintessence of the Five Phases (Wuxing): Mercury belongs to Metal (appearing white like silver), transforms into a blue dragon shape (Wood phase) when heated, and can crystallize into golden flowers (Metal phase), while simultaneously exhibiting characteristics of Water and Earth—thus truly containing all Five Phases. The "moon" symbolizes lead (known as the "Metal Lord"), representing Yin, which harmonizes with the Yang nature of mercury. Only through the union of these two complementary energies (Yin and Yang) can the elixir be successfully refined.

The alchemical process follows celestial patterns: A thirty-day cycle (symbolizing a lunar month) mirrors how the sun and moon complete their heavenly circuits. Specifically: The sun progresses one degree daily, completing a 360-degree cycle in a year; the moon travels 12-13 degrees daily, finishing its monthly orbit. Temperature control during refinement must strictly correspond to the positional changes of the twenty-eight lunar mansions, restarting the cycle each new month.

The waxing and waning of Yin and Yang determines success or failure: Yang energy initiates the process while Yin completes it. When the imbalance between them reaches its extreme, transformation occurs—like the moon disappearing then reborn. Each month when opening the furnace, practitioners must assess the elixir's condition based on these cyclical changes and adjust the firing accordingly.

Alchemy mirrors state governance: The firing temperature (the ruler) must be precisely controlled—never excessive (like arrogance), just as metal components shouldn't dominate; while mercury (the minister) must circulate smoothly without deviation. Should temperature control fail or materials become imbalanced, the entire alchemical endeavor will collapse.

This scripture primarily discusses the precautions in the alchemical process, using the principles of celestial movements as metaphors for the essentials of elixir refinement.

The ratio of mercury to realgar must be handled with particular care, just as the moon waxes and wanes. The firing process should follow the moon's cyclical rhythm: during the first quarter (eighth day), the heat should be steady; at full moon (fifteenth day), the fire must be strong; and during the last quarter (twenty-third day), the heat should diminish. Disregarding this rhythm would be like rulers and ministers abandoning the Dao (the Way), or like solar and lunar eclipses—inviting calamity. Negligence in alchemy invites divine retribution.

The alchemist must focus with the dedication of a loyal minister advising his sovereign, avoiding divided attention. The alchemical cauldron must stand as immovable as the North Star (Polaris), ensuring the refined spiritual mercury remains flawless—just as all stars revolve around the celestial pivot.

Fire regulation must be perfectly balanced (youyou renxia)—neither too hasty nor too sluggish. Excessive haste scatters the medicinal ingredients, while undue slowness chars them. This mirrors governance: a ruler must rely on wise ministers to bring peace and prosperity to the people.

The alchemical furnace (mingtang) must be sturdy and tightly sealed, with even heat distribution to prevent mishaps. This parallels a well-ordered state where a virtuous ruler governs with De (Virtue), ensuring harmony and averting disasters.

Throughout the process, the practitioner must maintain inner stillness and emptiness (nei yi yang ji anjing xuwu). Here, "ji" (the self) refers to the elixir—only when both internal and external tranquility are preserved can the elixir be perfected. Just as a person embracing serenity and detachment naturally attains clarity of mind and innate wisdom.

Finally, the gold and mercury in the cauldron resemble the radiance of sun and moon. Under controlled fire, the golden fluid and mercury merge into a pure white substance (yuanben yinming neizhao xinghai). The entire process demands unwavering stillness and stability.

This passage explains key stages and principles in the alchemical process. It first describes the transformation of mercury (quicksilver) within the crucible under heat: When the fire reaches sufficient intensity, the mercury separates from lead like a blossoming flower, forming the "Primordial Yin Elixir." This resembles plant growth from roots—the mercury gradually crystallizes into powder within the crucible, and after prolonged calcination ultimately turns to ash, revealing lead's essential nature. This process is likened to the meditative state of "sitting in oblivion" (zuowang), where practitioners eliminate distractions to observe their internal organs with clarity, attaining luminous enlightenment.

The text then emphasizes the crucial sealing technique. The "spiritual stalk" refers to golden mercury blossoms, while "Dui" (the trigram symbolizing openness) represents the crucible mouth—both must be tightly sealed to prevent mercury vapor from escaping. This mirrors how the human mouth serves as a gateway and the tongue as its bolt; careless speech invites misfortune. Similarly, alchemy requires vigilant safeguarding of critical junctures.

"Three Lights Submerging" refers to nurturing the "child pearl" (mercury) with the fire phases of sun, moon, and stars (symbolizing water, earth, and metal). Corresponding to the upper, middle, and lower Dantian (energy centers) in the body, internal Qi nourishes the six viscera. Just as seasonal fire phases refine the Golden Elixir, cultivating the Three Lights' essence can forge the Divine Elixir.

Though mercury's transformations remain invisible to the eye, the method is deceptively simple. As Laozi states, "What looks invisible is called 'the subtle'"—the true Dao appears obscure yet is fundamentally straightforward. In practice, mercury heated in a silver flask completes one cycle every twenty-four ke (ancient time units), fully transforming after one month. A flask glowing red then cooling to white indicates successful firing, while black spots require continuation. This "Yellow and White Technique" first refines mercury into sand before flask processing—the genuine elixir's metamorphosis follows the mysteriously invisible workings of the Dao.

This scripture primarily elucidates several key concepts and cultivation principles in alchemical practice:

In the alchemical process, metals (gold and mercury) undergo gentle nurturing by fire, much like jade being polished over time, ultimately forming a lustrous purple elixir. When ingested, this elixir permeates through one's skin and flesh.

Cultivation must follow gradual progression, just as tools are adjusted at the new moon and refined again by month's end. The "dry" material (referring to desiccated floral buds or metallic essences) in alchemy must first be ground into powder and mixed with mercury or cinnabar before being placed in the crucible. Without obtaining suitable raw materials, the alchemical process cannot succeed. The mentioned "golden flowers and yellow sprouts" constitute essential ingredients in elchemy.

The number "one" in Daoism represents the fundamental Dao, while secretly referring to the two alchemical materials of mercury and lead. Mercury belongs to northern Water, its number being "one"; lead, though externally black and water-associated, contains white gold within—this inner-outer distinction eludes ordinary comprehension.

Cultivation divides into superior De (Virtue) and inferior De realms: those of superior De embody serenity and wuwei (non-action), their minds free from distractions, wholly devoted to the path of longevity; those of inferior De may outwardly pursue the Dao yet inwardly chase fame and profit, making successful elixir attainment impossible even with formulas. True alchemy requires hidden virtue aligning with the Dao—divulging celestial secrets inevitably brings failure.

Finally, the text explains the relationship between upper and lower alchemical vessels: when the upper cauldron closes it's called "being" (referring to the medicinal substances), while the lower cauldron's closure signifies "non-being" (indicating emptiness). The "non-being" must nourish the "upper," for the higher realm contains the divine De (Virtue). This manifests the Daoist principle of "being and non-being mutually generating" within alchemical practice.

This passage explains the principles of furnace operation and substance transformation in alchemical practice. During the alchemical process, when the furnace vessel is opened, the medicinal substances churn vigorously; when closed, they settle to the bottom. If improper handling causes the substances to disperse, one must restart the entire refining cycle.

The alchemical furnace consists of upper and lower chambers. The upper crucible contains the divine elixir (dan), while the lower chamber remains empty—this constitutes the fundamental principle of alchemy. The two furnace apertures coordinate harmoniously, and when the substances heat within, they produce sounds resembling dragon roars and tiger growls. This phenomenon results from the dynamic interplay of Yin and Yang energies (the dragon representing Yang, the tiger representing Yin) inside the furnace.

The text employs the ruler-minister relationship as a metaphor for alchemical practice: fire regulation (represented by hexagram lines) functions like sovereign-subject coordination, forming the most essential and treasured law of alchemy. The explanation then details elixir formation:

"Knowing the white while guarding the black" refers to understanding mercury's (white) properties while maintaining lead's (black) foundational role, whereby the elixir's miraculous effects naturally manifest. Mercury (golden essence/Jinjing) represents metal's quintessence, while lead (metal lord/Jingong) belongs to northern water and serves as the elixir's basis. When mercury combines with lead, golden crystalline formations (golden flowers) emerge—this substance bears numerous names: Mysterious Yellow Blossom, Purple Powder, Stone Gall, Flowing Pearls, among several dozen appellations.

Successful alchemy requires this crystalline foundation. It must coat the furnace's interior walls and seal all gaps—otherwise, the process inevitably fails. Both water and lead-mercury belong to the northern direction. In the Five Phases system, water's numerical value is one, symbolizing the primordial state of "Dao begets One." Classical records prescribe combining one jin of mercury with celestial measurements to refine the Yin Origin Elixir; alternatively, using one jin each of cinnabar and yellow lead produces the Yang Origin Elixir.

(Note: Terms like "dragon-tiger," "metal lord," and "golden essence" represent standard Daoist alchemical terminology denoting Yin-Yang energies, lead, mercury, etc.; "Mysterious Yellow Blossom" and similar phrases describe various names for special crystalline substances formed during alchemical processes)

This passage explains the refining methods for lead, a crucial material in Waidan (external alchemy), the Daoist practice of mineral-based longevity elixirs. Lead is called the "Mysterious Ore" due to its black exterior, while its golden crystalline interior is termed "Yellow Sprouts." Lead possesses dual characteristics: its dark exterior belongs to Yin, while its concealed golden essence belongs to Yang, earning it the nickname "Metal Lord" (a common epithet for lead) as the primary material for refining the Five Metals (essences of five metallic substances).

Lead also bears the name "River Chariot," as it functions like a vessel carrying elixirs and a vehicle transporting essential essences. The golden crystals extracted from lead manifest in two forms: "Golden Flowers," produced by refining lead nine times and combining it with mercury in specific ratios to create a mica-like iridescence; and "Yellow Sprouts," which upon cooling form mirror-like crystals that break into horse-tooth shaped fragments.

Methods for refining Golden Flowers vary slightly among different schools. Some prescribe one pound of lead to four ounces of mercury, others two ounces, while ancient secret transmissions recommend an optimal three-to-four ratio. The process requires rapid heating—within half a day, Golden Flowers will bloom like mica. If the cooled product appears bluish, it indicates failed "Lead Flowers" unsuitable for use. Each refinement requires continuous mercury replenishment until no more Golden Flowers emerge.

For creating the "Pure Yang Elixir" (a fully Yang-aligned preparation), Golden Flowers must be mixed with lead granules and steam-heated in sealed conditions for one hundred days until achieving a reddish-brown hue, then ground with raw mercury in equal proportions for crucible refinement. The text particularly emphasizes that even the simplest refinement requires lead to undergo at least three purification cycles to obtain usable Golden Flowers.

This passage explains the concrete methods and theories of ancient alchemical practices. The primary material used in alchemy was qiushi (also known as lizhishi), which was prepared by applying a floral substance. When refining elixirs, any amount of raw mercury (liquid quicksilver) placed into the cauldron would successfully produce the medicinal pill.

To create huangya (a type of elixir), one took one jin of refined cinnabar (jingdan) and four liang of mercury, placing them into a porcelain bowl from Shouzhou. Using intense heat, it was rapidly melted into a mirror-like liquid, then cooled and solidified into a golden lump. When broken, it resembled horse teeth and, when used, was as effective as golden flowers. Most other claims about this process were incorrect.

Regarding the elixir known as yuhuaya, it had to be repeatedly refined within lead sand. The so-called "ninefold refined gold" method involved stir-frying lead into sand, then refining the sand back into lead—repeating this nine times. Xuanhan refers to the union of mercury (xuan) and lead (han), where the floral substance transforms into huangya, hence the name "xuanhan huangya."

Lead appears black with a yellow tint, like a person dressed in coarse cloth (he) yet concealing precious jade—its interior is pure white like jade, while its exterior is rough like a madman. Hence the saying, "Clad in coarse cloth yet holding jade, outwardly a madman."

Gold (silver) is the mother of water (lead), and within the mother hides the child. Lead contains silver—silver is the mother of lead, and lead is the child of silver, hence the phrase "the mother conceals the child’s womb." Conversely, water (lead) is the child of gold (silver), and within the child hides the mother. Silver, as the child, resides within the mother’s womb, demonstrating that silver is the crucial medium for refining the seven treasures and the essence of Yin-Yang.

The scripture states: "Do not damage my lead, lest you destroy my vital metal (essential substance); do not ruin my chariot (alchemical vessel), lest I lose my way home (fail to complete the elixir)." It also says: "If the lead is impure, it will struggle to unite with mercury; if the lead is pure, it will not lose its supporting ministers (auxiliary materials)." The two substances—qingyao shizhe (zengqing, a mineral) and chixue jiangjun (realgar)—one derived from mercury, the other from golden flowers, though different in nature, harmonize perfectly. Thus, refining the great elixir (supreme pill) cannot be done without lead.

When using lead, one must select cuoqian (high-quality lead)—only the salty, white, and greasy kind can produce floral teeth, while the bluish, bland, and flowerless variety is unsuitable. Xuanqian qingyao refers to zengqing, and chixue jiangjun refers to realgar—one is mercury, the other golden flowers.

This commentary on the Zhouyi Cantongqi explains the crucial process of lead-mercury interaction in alchemical practice. The so-called "True Person" (referring to the refined essence of alchemical substances) undergoes subtle transformations, appearing both existent and non-existent—here "non-existent" (wu) represents yang-lead, while "existent" (you) signifies yin-mercury. Silver, belonging to yang nature, is the true treasure; only those who understand how to extract true mercury from lead to refine the Golden Elixir (Jindan) can grasp its profound mystery.

When lead and mercury react, they appear to sink and float within the great furnace: first, the lead is melted into liquid, and when mercury is added, it alternately submerges and rises within the molten lead. This is the method for producing "golden flowers" (lead-mercury compound), where the mercury disperses within the lead liquid, enveloped and prevented from dissipating. In alchemy, one must first refine lead to create these "flowers" to subdue the mercury. Another interpretation suggests that the great furnace refers to the ash-pit method—smelting lead ore in an ash pit, where the lead sinks while silver rises to the surface. Once the pure white silver emerges, it can be used to refine gold. Both explanations hold validity.

During refinement, when mercury is added to the white molten lead, the mixture turns vermilion. The lead acts like a protective coat, encasing the mercury and stabilizing it to prevent volatilization. This passage describes the process from "white lead guarding black mercury" to forming "golden flowers," which are then placed into the alchemical cauldron.

The medicinal substances in the cauldron measure one cun (a Daoist standard unit for alchemy) in diameter and weigh one jin (the dosage prescribed in the Cantongqi). The cauldron symbolizes heaven and earth—the upper lid represents heaven, the lower lid represents earth. All things are born from the transformations of heaven and earth, and the Golden Elixir, originating from the Dao, must also be nurtured by their power. Thus, refining the elixir first requires preparing the cauldron (the alchemical vessel). The cauldron is positioned atop the "Three Terraces" (support structure) within the Supreme Unity Furnace (Taiyi Lu), holding a revered status as supreme as the heavenly principle.

The furnace is enclosed by walls (referring to the body of the Taiyi Furnace), with eight openings for ventilation on all four sides and twelve fire vents symbolizing the twelve double-hours of the day. The entire alchemical system strictly corresponds to the laws governing the movement of heaven and earth.

This passage explains the construction and usage methods of the alchemical furnace. The refining furnace has four layers corresponding to seasonal changes, shaped like the mythical Penglai Immortal Mountain (legendary celestial isle), or resembling ancient game vessels like the touhu (pitch-pot) or a gourd. The furnace can be made in melon or square shapes, but crucially must have operable rims and small locking mechanisms.

During operation, frequent water dipping and weight measurements are required. For practicing the "Yellow and White Art" (referring to techniques for refining the Golden Elixir and silver-mercury compounds), one should use a silver gourd capable of holding one jin (≈500g) of mercury (Hg), with dimensions of two cun (≈6cm) in diameter and one and a half cun (≈4.5cm) in height. The furnace body should be constructed according to the forms of the Five Sacred Mountains, with complete peripheral sealing to prevent mercury vapor leakage.

The most critical aspect of furnace maintenance is airtightness. Inadequate sealing will cause the medicinal essences to evaporate completely, leaving only red lead (lead oxide). As the scripture states "six plus one makes seven" (六一), seven materials must be mixed to create a lacquer-like sealing clay. Specific ingredients include the Eight Minerals (八石), Four Divine Substances (四神), golden essence, jade powder, with realgar powder and halloysite clay to be applied in separate upper/lower layers combined with ash salt. For silver gourds, a mixture of borax (大鹏砂) and tombak powder (鍮银末, copper-zinc alloy) should be used.

The text particularly emphasizes that poor sealing leads to alchemical failure. The furnace structure must interlock like dog teeth with curved nasal-like joints, forming an impregnable vessel. When the furnace's "divine Qi" (referring to fire control) fills the chamber, no excessive intervention is needed; but losing control means complete failure. Here "divine Qi" specifically denotes fire regulation, while "filling the hall" indicates using martial fire (intense heat). Since mercury is extremely volatile and slippery, the furnace must be absolutely gap-free, coordinated with the civil and martial fires (gentle and intense heat) matching seasonal changes, to achieve successful refinement.

This scripture primarily elucidates the methods and precautions of alchemical cultivation. It first emphasizes the necessity of single-minded concentration during practice, as even a wandering thought can determine the success or failure of the alchemical process. To master the arts of celestial ascent, one must first refine the cauldron vessels (alchemical instruments), skillfully regulate the firing times, and maintain unwavering perseverance to avoid failure.

Throughout the alchemical process, one must constantly monitor the dynamic interplay of movement and stillness. Typically, three practitioners take turns tending the furnace fire. Since Yang Qi (active energy) manifests as movement and Yin Qi (receptive energy) as stillness, with the cyclical transitions requiring continuous furnace supervision, constant vigilance is essential.

Practitioners should employ the method of inner vision (a contemplative technique for observing internal processes), guiding Qi circulation as if traversing celestial constellations. The alchemical chamber must remain immaculate, adorned with ritual implements: ghost-repelling braziers, authentic charts of the Five Sacred Peaks, talismanic scripts of the Eight Directions, and altars honoring divine beings like the Heavenly Youths, Jade Maidens, Eight Lords and Nine Perfected Ones. Most crucially, one must maintain purity of heart and sincere intention, visualizing the Supreme Nine Perfected Immortals and other sages encircling the chamber. Even without physical representations, sincere visualization naturally summons these sacred presences.

When establishing an alchemical altar indoors, encountering thunderstorms or unusual weather requires performing the Gangbu ritual steps (Daoist ceremonial footwork) like Yu the Great, moving according to specific patterned sequences. The firing cycles must follow the rhythms of the twelve double-hours and sixty-year Jiazi cycles, gradually transitioning from gentle "civil fire" to vigorous "martial fire" (referring to intensity modulation) in proper sequence for successful completion.

The text concludes with the principle of Yin-Yang interaction: Yin method refers to lead essence (alchemical material), corresponding to the Northern Kan-water trigram with numerical value one; Yang method denotes mercury, associated with the Southern Li-fire trigram valued at nine. When molten lead merges with mercury, the enveloped mercury resembles a fetus in the womb, floating rhythmically without escape. Practitioners must regulate breathing to exhale stale Qi and inhale fresh energy, expelling pathogenic influences while absorbing vital forces.

This passage describes the "lead-mercury" reaction process in ancient alchemy and the bodily sensations experienced during Neidan (internal alchemy) cultivation. Using alchemical metaphors for human cultivation, several key terms must be understood: lead (symbolizing the body's primordial Jing/essence), mercury (symbolizing the primordial Shen/spirit), and dragon-tiger (referring to Yin-Yang energies).

During alchemical refinement, mercury (Shen) undergoes fiery tempering within lead (Jing), causing the two to fuse. Like dragons and tigers exchanging breaths, the mercury produces sounds within the lead resembling intestinal rumblings. Through continuous day-and-night firing, the mercury eventually sublimates from the lead, forming a reddish-purple "True Yang Elixir" (embryonic form of the Golden Elixir). This mirrors the practitioner's unceasing cycle of exhaling the old and inhaling the new during cultivation.

However, prolonged practice leads to extreme physical exhaustion. Just as mercury grows dazed and sluggish when simmered endlessly in molten lead, practitioners maintaining constant vigil at the alchemical furnace experience mental haziness and bodily fatigue. Creating the elixir requires first refining mercury into granular form before blending with other materials and boiling in silver vessels. Authentic Golden Elixirs demand three years of preparation, whereas ordinary elixirs require only 120 days. Notably, gold-lead compounds cannot be ingested—they serve only material purposes.

At advanced stages, internal Qi surges like boiling lead-mercury in a cauldron, coursing uncontrollably through meridians. Practitioners feel their Dantian (energy center) brimming with Qi, their hundred vessels roaring like thunder, akin to boiling water. Yet such forced cultivation cannot confer longevity—it merely depletes vitality, leaving practitioners vacant-eyed and ultimately failing to attain the Dao.

The text concludes by critiquing those who erect altars in alchemical courtyards, making morning and evening offerings like worldly seekers. Such superficial rituals may yield dream visions, but true realization remains elusive. Emphasizing that external ceremonies and formalized practice—without genuine internal cultivation—are ultimately futile, the passage underscores the necessity of authentic inner work.

Alchemists who diligently tend their furnace fires with reverence often receive protection from spirits due to their focused devotion. Dreaming of divine manifestations at night hints at transformations in mercury (quicksilver), symbolizing how sincere altar rituals establish communion with the numinous—such resonance is called "attaining the Dao" (dedao).

When practitioners become complacent in their joy, believing immortality is assured, they misunderstand longevity's true source. Extended lifespan comes through arduous cultivation that earns celestial assistance, bringing inner fulfillment. Yet beware: even successful elixir consumption may prolong life, but commoners mistakenly equate spirit dreams with immortality. Such delusion leads instead to sudden death with corpses left rotting exposed.

This passage actually describes alchemical processes: after a year's proper firing, mercury separates from lead (the lead "dies and submits"), forming what's called the "True Yang Elixir" (zhengyang dan). The scripture's phrase "emerging from its womb in ten months" refers to mercury fully separating from lead at optimal firing. This metaphor critiques those who practice breath absorption, grain avoidance, and altar rituals—when they dream of spirits, they ecstatically presume immortality. In truth, such practitioners still face inevitable death without ingesting the Golden Elixir (jindan).

Botched alchemy that violates principles loses essential techniques. For instance, erratic mercury refinement through impatience forfeits core secrets. Without proper methods, one wastes furnace resources and risks fatal consequences. Even accidentally successful elixirs prove deadly if consumed without detoxification knowledge—just as misguided practitioners exhausting themselves on breathwork and altars cannot escape mortality.

Though myriad alchemical methods exist, true elixir secrets number only one or two. The Can Tong Qi scripture records merely two or three approaches, emphasizing comprehension of minerals' yin-yang attributes. Any method transforming mercury into violet elixir through firing constitutes the authentic "Great Return Elixir" (dahuan dan). All other teachings ultimately derive from lead-mercury theory. Mastering lead's mysteries controls mercury; without this foundation, ten thousand years of effort yield nothing. The supreme secret lies in the practitioner's skill—thus Dao seekers must extensively study classics and humbly seek guidance to ensure success. Arrogant stubbornness guarantees failure; even partial achievements will lack refinement.

The essence of inner alchemy (Neidan) lies in the proper application of lead and mercury. Ancient alchemical verses state: "White mercury gives birth to cinnabar, black mercury transforms into yellow elixir." Through the ninefold cyclical refinement process, five categories and three types of medicinal substances can be produced. When one attains the Purple River Chariot stage (referring to advanced elixirs), even gold becomes unnecessary. The authentic Great Return Elixir must demonstrate the capacity to fuse the five metals with mercury—this constitutes complete refinement.

Contemporary practitioners who grasp only superficial knowledge often proclaim success upon achieving preliminary mercury stabilization through fire control, claiming to have perfected the Great Return Elixir while denying the existence of more profound methods—a display of profound ignorance. In truth, genuine divine elixirs require no admixture of gold, silver, or mineral substances. Those elixirs adulterated with minerals may cure diseases but carry toxic side effects. Proper harmonization of lead and mercury alone suffices to produce the divine elixir of immortality.

Some practitioners employ only rudimentary lead-mercury combinations—for instance, roasting lead nine times to form an elixir, or burning mercury seven times to produce cinnabar before combining them in the crucible. They seal the vessel with realgar or process it with yellow elixir, even grinding gold and silver into powder to make clay, imagining these methods will yield perfected elixirs within a year. The result? Only residual gold, silver, and lead remain while other substances turn to ash and mercury completely evaporates. These deluded individuals still consider the residue divine elixirs; when the heavy metals cause bodily toxicity, they blame divine retribution rather than recognizing their fundamental misunderstanding of medicinal properties—truly playing with human lives.

Understand that while lead-mercury alchemy doesn't represent the most refined practice, mastering fire stabilization techniques can indeed produce longevity elixirs. Even when using lead as an auxiliary substance, complete removal is essential before consumption—lead serves merely as a temporary medium. Numerous alchemical methods exist, requiring extensive study rather than superficial imitation. Any approach contradicting the orthodox alchemical path of the Yellow Emperor and Laozi deviates from the authentic transmission of the Nine Capital Immortal Palace (the sacred Daoist alchemical tradition).

Authentic alchemical arts originated with the Yellow Emperor and Laozi. The Supreme Lord Lao's ninefold cyclically transformed golden elixir method represents the orthodox immortal palace transmission. The term "defying the Nine Capitals" refers precisely to departing from the true transmission of the Nine Teachings Alchemical Classics that Lord Lao imparted to Yin Xi (Laozi's disciple). Cultivators who violate these fundamental principles stray from the immortal path.

This passage primarily discusses important methods in Daoist alchemy and the realms attained after achieving immortality.

It first mentions esoteric alchemical techniques such as the "three transformations, five cycles, nine returns, and seven reversions," emphasizing that cultivation must strictly follow prescribed procedures without altering the sequence. Those who comprehend its mysteries can clearly grasp the path of practice. Students of alchemy should extensively study immortal scriptures to independently realize their principles.

Diligent practitioners refine the elixir day and night without cease. After three years, they can successfully produce the Golden Elixir (Jindan). Upon ingestion, one becomes impervious to water and fire, capable of freely transforming physical form, commanding spirits and deities, sharing the longevity of heaven and earth, and dwelling in perpetual joy without sorrow. Those who attain the Dao may retreat from worldly affairs while awaiting the opportune moment for ascension.

The "Great Unity" (Taiyi) refers to celestial officials in the heavenly realms who dispatch jade maidens and youths to guide elixir-consumed immortals to celestial palaces. If one ingests only half the dosage, they may temporarily remain in the human world to accumulate merit (Gongde). When virtues are perfected, consuming the remaining portion enables ascension. "Charts and Registers" (Tulu) serve as credentials for immortals, including sacred diagrams like the "True Forms of the Five Sacred Peaks."

The alchemical scripture Records of Fire (Huojì) conveys authentic teachings, employing the hexagrams from the Book of Changes (Yijing) to elucidate alchemical principles. The furnace crucible resembles a crescent moon or melon shape, termed the "reclining moon method furnace."

Regarding the interpretation of "white tiger as the pivot of refinement," some scholars identify the white tiger with orpiment (a mineral), considered crucial for processing mercury. However, caution is essential as orpiment contains potent toxicity—only specific varieties like purple orpiment or nest-born varieties from stork habitats should be used.

This scripture passage primarily discusses key concepts and operational methods in Daoist alchemical practices.

First, it addresses the selection of alchemical materials, noting that realgar (an arsenic-containing mineral) should not be used when refining the Great Elixir (a high-level alchemical product). The term "White Tiger" (Baihu) has two interpretations: if white materials are used in the alchemical process, a silver vessel is employed, in which case silver is called the White Tiger. Alternatively, it refers to a mixture of materials like golden flowers and xuanbai (a refined mineral substance) ground into a paste and applied to the alchemical cauldron as a crucial device for controlling mercury.

Mercury is referred to as "Flowing Pearl" (Liuzhu) because it embodies the essence of the sun, possessing a fluid and spherical nature. When lead is added to mercury and undergoes nine transformations, or when mercury is refined into a sandy form using a xuanbai vessel (a specialized alchemical container), the result is the Flowing Pearl.

The "Azure Dragon" (Qinglong) represents mercury, associated with the Water phase, while cinnabar corresponds to the Fire phase. The numerical value of Water is one, and Fire is two—their combination makes three, corresponding to the Wood phase of the East, hence the name Azure Dragon. By combining the Azure Dragon (mercury) with the Flowing Pearl (a lead-mercury compound), the elixir can be successfully refined.

The scripture further explains the symbolism of the East and West: the Azure Dragon of the East belongs to Wood and corresponds to the liver and the Yang spirit "Hun" (mercury), while the White Tiger of the West belongs to Metal and corresponds to the lungs and the Yin spirit "Po" (lead). Through the union of lead and mercury, the practitioner achieves the cultivation effect of harmonizing Hun and Po.

Finally, it describes the measurement method in alchemy: the first half of the lunar month (upper phase) and the second half (lower phase) each use eight taels of metallic material (half a pound of mercury and half a pound of lead flower), totaling one jin (sixteen taels), which corresponds to the 384 lines of the Book of Changes (Yijing). It emphasizes that alchemy must follow the balancing principles of Heaven and Earth, Yin and Yang.

This passage explains the metallurgical symbolism and precise measurement principles in Daoist alchemy. Mercury (Hg) symbolizes the sun, while lead represents the moon—their cyclical interaction embodies the original meaning of the character "Yi" (change). Mercury's intrinsic nature belongs to metal (Jin), appearing red to correspond with the southern direction, hence called "vermilion gold" (Chi Jin). Lead contains silver, whose white color aligns with the west, termed "white gold" (Bai Jin); it also produces golden crystals, earning it the name "gold."

In alchemical practice, precise material ratios are crucial. Eight ounces for the waxing moon (represented by the Dui trigram) and eight ounces for the waning moon (also Dui) combine to form sixteen ounces of silver as the vessel. The Dui trigram signifies fusion, while the Qian trigram denotes the method for refining mercury—only through the harmonious interaction of Qian (Heaven) and Kun (Earth) can the alchemical apparatus be perfected. This section primarily elucidates the exact measurement standards for compounding elixirs.

True gold does not lose its luster in fierce flames; mercury-gold's nature remains unaltered by fire, and the completed elixir retains its color even when heated. Impurities cause transformation, just as gold and silver vessels remain undamaged by fire. When using gold and silver in alchemy, their metallic nature remains constant, mirroring how the sun and moon have shone brightly since the creation of heaven and earth—symbolizing how the elixir suffers no depletion when the cauldron is inspected monthly.

Mercury's essence is gold, sharing gold's weight while embodying solar and lunar forms: as cinnabar it manifests solar qualities, as mercury it reflects lunar attributes. Some misguided individuals erroneously believe physical gold must be used, fearing to attempt otherwise. In truth, the "gold" referenced here refers to mercury and "golden flowers" (lead crystals). Ancient mnemonics state: "Using real treasures correctly versus misusing mistaken gold," explicitly clarifying that employing physical gold and silver in alchemy is a grave error.

Golden flowers actually emerge from lead. Lead belongs to northern water (associated with the moon), hence the saying "gold originates from the moon." On the first lunar day (Shuo), it receives the solar talisman imprint—the sun here signifies mercury, while the Kun trigram represents earth. Beginning from Shuo, the first day's changing lines form the Zhen trigram, symbolizing direct resonance (Zhi Fu), with the Fu hexagram governing the day. The Zhen trigram represents the lower vessel containing mercury, hence termed "receptacle." Dawn employs the Zhen trigram, dusk the Gen trigram—both daily and monthly cycles utilize these two trigrams. This can also be interpreted as mercury entering lead to generate golden flowers, called "heaven-earth talismans," hence the phrase "Shuo receives solar talismans."

This passage explains the principles and processes of metal transformation in alchemical practice. Mercury (quicksilver) is originally extracted from cinnabar, which serves as its mother substance. Through the process of heating, mercury can revert back to cinnabar, and cinnabar can then transform into gold, completing the cyclical process of "gold returning to its mother," ultimately refining the "Golden-Sand Reverted Elixir" (a superior alchemical medicine).

The alchemical process must follow lunar phases, with each month's last day (the dark moon) marking the completion of a minor cycle before restarting on the new moon. In alchemical equipment, the "wall" refers to the Great Unity furnace, the "outer wall" denotes the Great Unity cauldron, and the "void" represents the fire of the southern direction. Metal materials are concealed within the cauldron and slowly refined through hidden fire—a process termed "submersion."

Mercury inherently possesses gold's nature; when refined through yin-yang fires into golden sand, it restores its original metallic properties. As the elixir nears completion, light will emanate from the cauldron, bringing joy to the alchemist.

Numerical symbolism represents key alchemical elements: "Zi-Wu" (midnight-noon) symbolizes mercury and cinnabar, where water's number one plus fire's number two equals three; "Wu-Ji" (earth phases) represents silver and lead, where water's one plus metal's four equals five. The harmonious interaction of three and five forms the crucial number eight (when metal qi peaks in the eighth month), though note that the "eight minerals" mentioned here don't refer to eight ores but rather the perfect union of mercury and gold.

Finally, the principle of yin-yang pairing: mercury belongs to wood (dragon), lead belongs to metal (tiger), and metal overcoming wood creates a conjugal relationship. The dragon exhales while the tiger inhales, mutually attracting and subduing each other. The true "Great Reverted Elixir" can only be achieved through the proper pairing of gold and mercury—all other minerals merely play supporting roles.

Yellow Earth (a special soil used in alchemy) is the source of the Metal element. When this earth, containing mysterious white metallic components, is applied inside the alchemical furnace or cauldron, the resulting golden patterns are called the "Golden Cauldron." This does not refer to a cauldron made of actual gold or silver, but rather to the fact that earth nurtures all things, and the Metal element is born from earth. Thus, earth is called the father of Metal.

Here, the Metal element specifically refers to golden sand transformed from mercury (quicksilver), also known as "Yellow Sprouts" (the yellow substance formed in the early stages of alchemy). It bears the designation of Wu-Ji (戊己, associated with earth in the Five Phases) and is used to harmonize mercury and coat the interior of the cauldron. Another secret teaching states that Yellow Earth is actually a collective term for four yellow minerals—realgar, orpiment, arsenolite, and others—all of which belong to the earth element. Earth governs the seasons in rotation but has no fixed form; it requires the power of fire to manifest, presiding for eighteen days in each season. This precious formula does not directly use the four yellow minerals.

The flowing pearl-like substance (molten metal) is the origin of the Water element. Here, "flowing pearl" is another name for the golden patterns, while Water refers to mercury, which belongs to the Water element and is thus called the mother of Water. When mercury obtains the golden patterns, it becomes the source of mercury itself.

The Water element is restrained by the Earth element—covering mercury with earth prevents its evaporation. However, according to the Grass Hall Commentary, simply covering it with Yellow Earth is ineffective. Various secret teachings recommend combining it with items like the "Metal Five Talismans" (a Metal-element ritual object) to suppress it. From this, we understand that the earth here actually refers to substances like golden patterns and Yellow Sprouts. When mercury is subdued by these earth-derived substances, it no longer evaporates—this is not the same as using sulfur to transform mercury into cinnabar.

The Vermilion Bird (the divine bird of the south) embodies the essence of Fire, representing the Fire-attribute stars of the southern seven mansions and symbolizing the essence of solar energy. The key to regulating the fire lies in maintaining balance: when the fire is strong, add more charcoal; when it weakens, reduce it. The precise timing of the alchemical process is determined by observing the position of the Big Dipper's handle and the water clock.

When the Water (lead) element becomes excessive, the Fire (mercury) is extinguished, and both return to thick earth. This refers to the process where, when lead melts under heat and mercury is added, the mercury "dies" (undergoes chemical transformation) under the fire's influence, forming a sandy substance that returns to the earth like dust or ashes.

The three essences (earth, Metal, and mercury) ultimately merge into one, as they originate from the same source. Earth is the root (the origin of the golden patterns), the first is mercury, the second is Metal, and the third is cinnabar—all three share the same ancestry, revering earth as their forebear, and thus they eventually reunite.

"Jusheng" (meaning "great transcendence") can prolong life, and the refined Reverted Elixir can be ingested. "Ju" signifies greatness—this elixir surpasses all others, hence its name "Jusheng." It is also called the "Sun Essence Elixir" or "Ten Victories Elixir," all being different names for the Reverted Elixir.

This passage explains the efficacy and principles of refining the Golden Elixir (Jindan, the Daoist alchemical medicine). Cinnabar sand (the Great Return Elixir) is formed when mercury undergoes three years of fiery refinement, transforming while retaining gold’s indestructible nature, thus becoming the most precious treasure among all things.

After ingesting this Golden Elixir, the medicine disperses through the five viscera and six bowels like wind and rain, spreading throughout the body. Ordinary people who take it may experience temporary feigned death—a result of uncleared waste, pathogenic Qi, and parasites (what Daoism calls the "Three Corpses and Nine Worms") still lingering within. If the elixir contains incompletely purified minerals like realgar or azurite, their residual fiery toxicity can also induce temporary unconsciousness. However, long-term practitioners who cultivate purity and restrain desires, having cleansed their internal organs, will not experience such reactions.

The text particularly emphasizes that refining superior Golden Elixir must not involve adulteration with mineral-based medicines. If realgar, orpiment, or similar minerals (known in Daoism as the "Yellow and White Arts") are used, their toxicity must be completely neutralized before application. Yellow earth (or iron cauldrons coated with yellow clay) plays a crucial role in alchemy—like a general securing the four directions, it stabilizes the refining environment, controlling mercury’s fluidity (symbolizing the circle) and gold’s form (symbolizing the square).

Ingesting the Golden Elixir yields wondrous effects: the elderly regain youthful complexions, their skin moisturized, sinews and bones strengthened, even white hair turning black again. For Daoist cultivators, consuming it extends lifespan and ultimately transforms the physical body, enabling ascension to immortality. The phrase "earth roams through the four seasons" refers to the yellow-earth cauldron’s role in alchemy—like the virtue of earth governing the seasons, it maintains the furnace’s stable operation.

After consuming the elixir, white hair turns black again, and lost teeth regrow. The elderly (those aged sixty are called "old") regain the vigor of youth, while aged women (seventy is called "qi," ninety is called "yi") become as radiant as young maidens. By transforming their physical forms, they transcend worldly calamities—such individuals are called "Zhenren" (True Persons). Through refining the essences of Yin and Yang into the Golden Elixir (Jindan), they achieve metamorphosis, sprout feathered wings, and gain abilities such as invisibility, shape-shifting, and commanding spirits. They become impervious to fire and water, attain immortality, develop bones like gold and marrow like jade, and remain unharmed even by the three cosmic calamities.

Two analogies illustrate the transformative principle of the elixir: just as lead powder (hufen) reverts to lead when cast into fire, and mercury (shuiyin) can be refined back into gold, so too can snow and ice melt into water (referred to as "Tai Xuan," symbolizing water), and gold and mercury combine to form the elixir. Authentic Golden Elixirs must be made from lead and mercury (where "golden sand" refers to their compounds), undergoing repeated calcination and transformation ("yellow sprout" being an intermediate product). It is not simply a matter of grinding gold and silver into powder and mixing them with mercury.

The refining process follows the principle of "like attracts like": metallic ingredients (belonging to the "Great Yang" solar energy) and mercury (belonging to the "Great Yin" lunar energy) mutually restrain and transform each other. This natural law of Yin-Yang mutual generation is the foundation of alchemy. Those who aspire to become immortals through elixir consumption must master this principle of material transmutation.

This scripture discusses the temporal cycles and natural conditions required for refining the "Great Reverted Elixir" (the highest-grade alchemical medicine in Daoism). It explains that true lead-gold (alchemical material) is extremely difficult to obtain, as metals belong to the Great Yin (yin energy) and must combine with yang energy to become the homogeneous substance needed for alchemy.

The Great Reverted Elixir imitates the formation of naturally occurring reverted cinnabar. Natural reverted cinnabar grows in areas containing cinnabar and requires 4,320 years to fully develop. When fully formed, it emits radiant light visible for a thousand miles. During the Three Origins festivals (important Daoist holy days), celestial officials from the Purple Tenuity Heaven and Jade Pure immortals descend to collect it—this is not something ordinary humans can easily obtain.

The natural reverted cinnabar grows surrounded by specific mineral formations: azurite (a copper ore) above, realgar to its left, orpiment to its right, gold sand below, cinnabar to the south, and mercury to the north. This arrangement results from the convergence of yin and yang energies between heaven and earth. The entire formation process occurs in four stages: first 1,080 years to form gold ore, another 1,080 years to transform into cinnabar, then 1,080 years to become mercury, and finally 1,080 years to mature into natural reverted cinnabar—totaling 4,320 years.

The alchemical time calculation follows a special system: twelve months in a year correspond to 4,320 shichen (ancient time units, each equivalent to two modern hours), with each shichen representing one year. Thus: one year of firing produces the Small Reverted Elixir, two years the Middle Reverted Elixir, and three years the Great Reverted Elixir. The process employs the Qian (Heaven) and Kun (Earth) trigrams (two fundamental symbols from the Yijing) to regulate the firing. Each trigram has six lines (yao), totaling twelve lines. Each line governs two and a half days, with two lines covering five days—exactly one xun (ten-day cycle). This makes one month equivalent to an annual cycle.

Refining the Great Reverted Elixir requires three and a half "Great Cycles" (each lasting 1,320 years) plus one "Small Cycle" (60 years), totaling approximately ten years of firing time. The calculation also accounts for intercalary months and variations between long and short months. The text concludes by mentioning cinnabar and mercury sources, particularly noting the high purity of mercury from Chenzhou and Jinzhou—where one dou (about 10 liters) weighs a hundred jin—while mercury from Lingnan and foreign lands requires one dou and one sheng to reach equivalent weight.

This scripture primarily discusses the methods for selecting and combining mercury (liquid metal) and various minerals in alchemical practices.

It first explains that the finest mercury is naturally occurring "Zhouwu Creek mercury," which is clear and white in appearance, making it suitable for alchemical refinement. In contrast, artificially produced mercury obtained through distillation (known as "ripe mercury") appears turbid and dull, suitable only for pigment production or metallurgy but inappropriate for medicinal or alchemical purposes.

For alchemy, the best choice is "radiant cinnabar" (a high-quality form of vermilion), which comes in large pieces about three to four inches square with horse-tooth-like textures, appearing translucent and bright. Several other forms of cinnabar are described: fist-sized pieces are called "cinnabar children," millet-sized grains are termed "vermillion sand," and those white outside but red inside are called "white horse-tooth cinnabar." The finest quality exhibits a purplish-red hue with a lustrous sheen, while pomegranate-seed-sized pieces may also be used.

The text then cites the Five Metals Classic to explain the principles of mutual generation and restraint among metals: gold combined with silver becomes hollow, silver with copper becomes porous, copper with iron undergoes transformation, while iron and tin can coexist harmoniously. It particularly notes that mercury (liquid metal) becomes pliable when combined with gold and develops special efficacy when paired with realgar.

The scripture emphasizes that alchemy must follow the principle of Yin-Yang mutual regulation—using mercury alone (pure Yang) is ineffective and must be balanced with Yin-based substances. Several specific formulas are provided: for instance, mixing eight taels of silver powder with seven taels of mercury and one tael of realgar; or boiling mercury in a silver vessel to form sand, then processing it with orpiment and realgar coatings.

Finally, it mentions several questionable alchemical methods—such as combining gold with mercury and realgar, or mixing cinnabar with mercury—but the author cautions that these techniques lack verified efficacy, may contain toxicity, and their long-term safety for ingestion remains uncertain.

This passage explains the key principles of material pairing in elixir preparation, with the core concept being the "like begets like" doctrine. Just as crops must be grown from seeds of the same species, alchemy requires properly matched foundational materials.

Specific techniques include:

• Mercury and cinnabar should be combined in precise ratios, with sulfur added every seven days to facilitate transformation. Alternatively, vermilion (mercury sulfide) can be used with mercury, adding realgar during the twelfth month.
• Just as rice cultivation requires rice seeds, alchemy must use minium (lead tetroxide) as its base material. Once the elixir is perfected, it becomes the new "seed" for subsequent refinement.
• Similar to how only chicken eggs can hatch chicks, the Golden Elixir (Jindan) requires metallic essences (golden flowers) as its homologous material for successful preparation.

Nature universally follows this "like begets like" principle:

• Swallows cannot birth phoenixes, nor foxes produce horses
• Water flows downward while flames rise upward
• Only substances of identical nature can mutually transform

The text criticizes contemporary immortality seekers who:

• Possess extensive knowledge yet miss the essential point
• Lack proper transmission from enlightened masters
• Experiment recklessly with various formulas
• Employ random materials like gold/silver, realgar/orpiment, azurite/cinnabar
• Remain confused about timing (claiming either one year, sixty days, or nine cycles) and dosages
• Mistake accidental successes for perfected elixirs
• Produce compounds that cannot withstand fire testing
• Upon failure, either abandon practice or refuse guidance
• Ultimately waste vast resources and time

These failures stem from ignoring the fundamental "like begets like" principle, relying instead on textual conjectures and haphazard combinations of chalcanthite, mica, arsenopyrite, magnetite, sulfur, and lead.

Those who obsess over alchemical practices without authentic transmission, upon encountering minor heterodox techniques, immediately believe they've attained the Great Dao (道). They scour ancient texts for cryptic phrases, yet wildly misinterpret the terminology: calling gold silver, water wood, the tiger (lead-mercury alchemical term) orpiment, the dragon (alchemical term) azurite, earth realgar, golden flowers white silver, yellow sprouts (lead essence) sulfur, autumn stone (human urine sediment) orpiment, while claiming that chalcanthite originates from Puzhou or Qiangdao regions.

These self-proclaimed clever ones remain ignorant of how sacred and precious the true elixir formulas are. How could they know chalcanthite actually derives from lead, or that both autumn stone and yellow sprouts are products of the "Golden Lord" (lead's alias)? The "Yuzhang" mentioned in scriptures originally referred to Raozhou's ancient Yuzhang County in Daozhou, not today's Hongzhou Yuzhang. Some now mistakenly use Hongzhou Yuzhang's earth for vessels, even mixing mica, orpiment, magnetite, sulfur and chalcanthite for alchemy - a grave error. Classics clearly state cultivation must follow proper methods, yet they don't even understand basic rituals - how could they glimpse the truth?

More absurdly, some take mercury's alias "hong" to mean the five-mineral copper from furnace bellows for making vessels. How can they succeed when randomly using five metals for crucibles without understanding principles? Remember: gold, silver, copper, iron and tin all derive from ores - the "five minerals" don't mean furnaces directly produce metal. To refine mercury into silver requires silver vessels; elixir preparation needs earthen crucibles. When refining lead, failure is certain unless one first extracts "mysterious white golden flowers" (lead's essence) to coat the interior.

How can materials of different natures be forcibly combined? A thousand attempts will yield ten thousand failures - what they deem clever becomes folly. From youth to white-haired age, they exhaust family fortunes collecting various scriptures and minerals yet never grasp essentials. Abandoning the true path to cling to delusions, they're like men viewing heaven through bamboo tubes - how can they perceive the Dao's (道) entirety? Failing to comprehend the Cantong Qi's true meaning, they plunge deeper into heresy - this is the tragedy of clinging to delusions without awakening.

Those who grasp but a single method or obtain one scripture's oral formula yet believe they've mastered all mysteries are like viewing light through a bamboo tube—how could they perceive the vast heavens and earth?

Speaking of the greatest sages, none surpass Fuxi who created the Bagua (Eight Trigrams), modeling them after the movements of heaven and earth. Fuxi (one of the Three Sovereigns of antiquity, who ruled through the virtue/power [De] of Wood) observed celestial phenomena and the patterns borne by the dragon-horse emerging from the Yellow River, thereby establishing the Bagua. Later, Shennong expanded these by doubling them into sixty-four hexagrams. The Yijing states, "The Dao of Heaven transforms, and the sages all emulate it."

King Wen of Zhou (the sage-king between the Shang and Zhou dynasties) further developed the hexagram images and composed the line statements. Confucius (honored as foremost among sages) then created the "Ten Wings" (including commentaries like the Tuanzhuan and Xiangzhuan) to elucidate the Zhouyi. This classic bore different names across eras: Lianshan in the Xia dynasty, Guicang in the Shang, Zhouyi in the Zhou, Taixuan in the Han, and Tonglin in the Jin. The most profound alchemical methods are all expressed through the Zhouyi's hexagram symbolism.

The three sages—Fuxi, King Wen, and Confucius—arose successively, each contributing differently while attaining distinct levels of realization. Though they comprehended the Dao of prosperity and decline, even they dared not lightly attempt alchemical practices (referring to furnace-fire techniques). How then could ordinary people presume to fathom creation's mysteries? One must personally receive authentic oral transmission to truly master them.

Before the era of the Three Sovereigns, people lived in primal simplicity. After the Five Emperors, worldly affairs grew increasingly artificial. Thus the ancients could forge the Golden Elixir with just two simple ingredients, while later practitioners had to study the properties of numerous minerals—revealing the relative merits of ancient and modern alchemical methods.

Creating elixirs requires following specific procedures; they cannot be haphazardly combined. Each zhu (an ancient weight measure, with 384 zhu per jin corresponding to celestial degrees) must be precisely measured. Just as mercury (a primary alchemical material) becomes manageable when combined with golden flowers for refining gold and silver, so too must all preparations have proper foundations. Without gold as mercury's basis, one's efforts become rootless plans destined to fail.

This passage primarily discusses the transmission and comprehension of alchemical practice. It begins by noting that even the forms of water and fire are difficult to control, let alone the wondrous transformations of mercury (a key alchemical material), which lacks discernible signs and is truly unfathomable. True cultivators record alchemical methods in scriptures, yet ordinary people often fail to grasp them—just as Confucius edited the Book of Songs and established rituals, if one does not understand the profound meaning of the Cantong Qi (Triplex Unity), cultivation will inevitably fail, and even if achieved, it will not endure.

The author emphasizes that alchemical practice must be transmitted through master-disciple lineage to be truly comprehended. Materials like silver, gold, lead, and mercury cannot be understood without a master’s guidance. Even Xu Zhenren (likely referring to Xu Congshi, an Eastern Han alchemist) attained realization only through his teacher. Texts like the Cantong Qi deliberately obscure their secrets, presenting them in cryptic and inverted language to prevent the divine mechanism from being carelessly revealed. Yet if nothing were disclosed at all, the path to immortality might be lost, so the teachings are reiterated through layers of text.

Vivid metaphors illustrate this point: like standing in an open field without a canopy—what use is mere imagination? Or climbing a high tower with closed eyes—one sees nothing. Those who seek alchemical knowledge but refuse deep contemplation will struggle to succeed, no matter their effort. Though the Fire Record (Huoji), an alchemical scripture, contains over six hundred chapters, their core principles are the same. The elaborate language merely ensures ordinary minds grasp them. The true secret lies in the harmonious interaction of gold and mercury, the interplay of Yin and Yang—the principle of "one metal, one mineral" is fundamentally clear.

Finally, the author declares that he composed the Cantong Qi with sincere intent to transmit the teachings, never deceiving future seekers of wisdom. He urges readers to reflect deeply and attain realization themselves. Here, "gold and mercury" refer to the alchemical reaction between metals (like gold) and mercury, while "one metal, one mineral" subtly points to the foundational principles of internal alchemy (Neidan). The passage underscores that cultivation requires both a master’s guidance and personal insight—mere speculation is insufficient.

To remain silent would sever the transmission of the Dao and incur karmic offense; yet to reveal all risks having the teachings disregarded. Thus we stand at this crossroads—neither daring to impart complete knowledge, nor bearing the guilt of letting the sacred methods perish.

When recording cultivation insights on bamboo slips and silk scrolls, we fear disclosing celestial secrets (the "fu" talismans symbolize heavenly intent, while mercury represents the essence of heaven and earth capable of generating five celestial signs). Hence we hesitate, sighing deeply as we vacillate between concealment and transmission. Though committed to writing, we must resort to coded language and deliberately obscure expressions.

The method for refining the Golden Elixir (Jindan) originally followed established protocols, yet we cannot bear to disclose them fully. Here we shall only outline key principles, revealing but fragments. Through symbolic representations ("establishing images" means using concrete forms to express abstract truths), we manifest celestial will—without which the core of the heavenly Dao remains hidden. Now we shall directly address the crucial process where gold and mercury coalesce into the elixir.

Using gold (referring to the golden blossoms formed from nine-times refined lead essence) as a "dike" to contain mercury, enabling stable fusion. This "dike" actually denotes a retention technique (special refining method) to fixate the mercury. Note we use lead-essence golden blossoms, not ordinary gold and silver. Alternate interpretations suggest using gold to make the alchemical cauldron also called a "dike"—this belongs to the Silver Pot Master method (a Waidan technique), not true Golden Elixir practice. Only when mercury perfectly merges with golden blossoms can the "serene harmony" (optimal stability) be achieved.

The gold (lead-essence golden blossoms) quantity is fifteen liang. Because mercury's volatile nature requires such measure to restrain it—this follows the principle of using Yin to control Yang. Mercury likewise measures fifteen liang, symbolizing a lunar cycle. Another tradition recommends fifteen liang of azurite mineral divided into five portions, with nine liang golden blossoms, six liang azurite, and one jin of mercury—this proportion indeed embodies the alchemical art's profound subtlety.

This passage primarily discusses the proportional ratios for using zengqing (a copper-containing mineral commonly employed in Daoist alchemy) and mercury in elixir refinement. The text notes that ancient practitioners used only zengqing as the sole ingredient to transform mercury into elixirs, yet the Zhouyi Cantongqi (the classic "Token for the Agreement of the Three") exclusively discusses gold and mercury as materials, suggesting zengqing shouldn't theoretically be used.

Regarding medicinal quantities, the text elaborates on the meaning of "five portions": three liang (taels) constitute one portion, so five portions equal fifteen liang. Adding one more liang completes sixteen liang (the traditional weight of one jin). This number—384 zhu (an ancient weight unit)—corresponds to the hexagram calculations in the Yijing (Book of Changes). While earlier texts used fifteen liang to symbolize the half-moon phase, this contradicts Yijing principles, hence practitioners must add one liang to achieve the complete jin measurement in actual practice.

The gold-mercury ratio in alchemy maintains equal halves: fifteen liang of metal corresponds to fifteen liang of mercury, symbolizing the harmonious union of Yin-Yang (Qian/heaven representing Yang, Kun/earth representing Yin), mirroring the thirty-day lunar cycle. Constant measurement is essential to maintain this unchanging ratio—if deviations occur, fire regulation must be adjusted immediately: increased heat for insufficient quantities, reduced flame for excess.

True elixirs require only two substances: gold and mercury. The so-called "three materials" (gold, mercury, and water) aren't actually independent components. After ten months of regulated firing and sixty days of natural transformation, a pure Yang divine elixir can be perfected, for genuine Yang Qi continuously operates beneath the alchemical furnace throughout the process.

This passage describes the ancient alchemical method for refining "Yellow Chariot Elixir" (Huangyu Dan). The key to successful alchemy lies in precise fire regulation—excessive heat burns the ingredients, while insufficient heat prevents proper elixir formation. The process begins with gentle "civil fire" (wenhuo) for gradual heating before transitioning to vigorous "military fire" (wuhuo), requiring the same careful control as herding chickens.

The refinement occurs in distinct phases: First, mineral ingredients (primarily mercury and azurite) are placed in the crucible and heated until liquefied, then condensed to form the bluish-yellow "Yellow Chariot" preliminary elixir. Its name derives from its chariot-like hue, as consuming this substance was believed to enable celestial ascension. After ten months of refinement, the mercury separates from lead to form a crimson substance called "True Yang Elixir" (Zhengyang Dan), appearing dust-like in texture.

The ingredients undergo dramatic color transformations during the process: initially resembling charcoal ashes—a stage where many practitioners abandon their work upon seeing the blackened mass. Continued firing gradually turns the substance brown, then reddish-purple. The authentic elixir ultimately achieves a violet hue with an ethereal, dust-like consistency. The complete cycle requires two years—the first year yields the preliminary elixir, while only the second produces the "Great Elixir" (Da Dan).

The "Crimson Gate" (Chimen) refers to a crucible made of red clay, its surface adorned with golden floral patterns that enhance its vermilion appearance. During refinement, residues from earlier stages must be pulverized and returned to this scarlet crucible for further processing. The text emphasizes that without comprehending these principles of fire regulation and chromatic transformation, achieving genuine elixir alchemy remains impossible.

This passage details the specific procedures and precautions for refining Waidan (external alchemy, where Daoists prepare elixirs by smelting minerals in cauldrons). First, lead sand and yellow earth must be pounded into mud to seal the alchemical cauldron. For refining yang-natured elixirs, one must begin with "martial fire" (intense flame) for sixty days—the ideal result is a purple-colored elixir. If the color hasn't turned purple, continue refining. A purplish-red hue indicates superior quality, while bluish-black signifies inferior grade.

Different elixirs require distinct methods: the Twofold Elixir needs no covering, while the Ninefold Cycled Elixir requires four taels of Mysterious White Gold Blossom (a mineral) as a covering for each cycle. The Purple Wandering Elixir must be covered with red salt (a crimson mineral salt), a method called the "Red Gate." Sealing the cauldron mouth demands meticulous care to ensure complete airtightness.

Fire regulation is crucial: maintain steady flames beneath the cauldron, avoiding excessive intensity. Begin with "civil fire" (gentle flame) for seventy days—during this stage, the heated mercury (quicksilver) will produce sounds resembling a baby's cry. If the sounds cease, it means the mercury has achieved "subdued fire" (stabilized properties), at which point the fire must be maintained continuously day and night.

The refining process occurs in stages: start with civil fire, then use it exclusively for 360 days in the middle phase. Though martial fire was initially prescribed, the stabilized mercury allows for gentler heat. The final phase requires martial fire again until the cauldron's surface matches the flame's color. The Pure Yang Elixir must undergo martial fire to reach completion, after which the elixir is pulverized and refined anew. A full cycle takes three years, though one-year refinements remain usable—the three-year product is simply of superior quality.

Each month, the cauldron should be opened for inspection, cleaned, resealed, and refining resumed—twelve months constitute a complete cycle. After twelve months of fire refinement, the essences (soul and spirit) of mercury and lead fully merge, yielding the Great Elixir. The final product becomes a vivid purple, known as the "Returned Elixir," which has multiple names: Purple Gold Sand, Purple Powder, River Chariot, and Jusheng ("Supreme Victory"). "Jusheng" is an epithet for the sun, as mercury symbolizes solar essence.

This passage explains the methods and principles for refining the "Great Reverted Elixir" (Dahuan Dan). When Laozi (Lord Lao) journeyed west beyond Hangu Pass to the Western Regions, he transmitted this alchemical technique to Yin Xi, naming it "Flowing Numinous Cinnabar" (Liu Ling Sha).

A true numinous elixir must exhibit a purplish-red hue. If the color lacks sufficient crimson-purple saturation, the firing process must continue. Should the color resemble yellow lead oxide or red clay, it merely constitutes ordinary "subdued mercury medicine" (Fu Huo Gong Yao), unworthy of being called a true Golden Elixir (Jindan).

The crux of alchemy lies in the mutual generation and restraint of Yin-Yang. The Yang nature of mercury (Shuiyin) interacts with the Yin nature of metals (Jin), undergoing natural transformation akin to food digestion, ultimately coalescing into the elixir. This process of gold-mercury fusion accords with the Dao of nature—the resulting elixir not only prolongs life but cures myriad ailments. However, ordinary dried mercury preparations can only produce ointments or powders; though they may extend longevity, they cannot be considered the "Great Reverted Elixir."

The term "Reverted Elixir" (Huan Dan) refers to returning mercury to its original state. Since mercury is the essence of cinnabar (Zhusha), and cinnabar itself is the descendant of gold, the refining process reverses this relationship—transforming it back into golden solid matter with a crimson-purple hue. Hence "reversion" denotes returning to the origin.

To detoxify the completed elixir, one may blend it with jujube pulp or Yellow Dragon ointment, forming pills the size of phoenix tree seeds. One pill constitutes a "knife-measure" (Daogui, an ancient medicinal spoon), equivalent to 1/24 of a tael (liang). The elixir must prove capable of transmuting all five metals (gold, silver, copper, iron, tin)—failure indicates incomplete detoxification, requiring further firing until achieving deep purple coloration to qualify as the true "Great Reverted Elixir."

Dosage follows strict protocols: four taels constitute one dose. Those wishing to remain in the human realm take half-doses; those seeking ascension take full doses. A single knife-measure portion can commune with spirits and instantly transmute one catty of mercury into gold.

The alchemical principles inherently involve the Five Phases (Wuxing): mercury corresponds to Water, cinnabar to Fire, lead to Metal, azurite to Wood, and realgar to Earth. Yet the core ingredients remain just two—gold and mercury—which inherently contain all Five Phase attributes: cinnabar (Fire), mercury (Wood), black lead (Water), silver (Metal), supplemented by central Earth (Wuji Tu). Just as water controls fire's intensity, the mutual generation and restraint of Five Phases enables successful elixir refinement.

This passage elucidates the principles of Yin-Yang and the Five Phases in Daoist alchemy, along with essential techniques for both external (Waidan) and internal (Neidan) cultivation practices.

Water corresponds to Yin, while fire corresponds to Yang. When water is used to douse fire, Yin energy dissolves Yang energy—this is the meaning of "extinguishing the light." In alchemical terminology, water symbolizes the "golden flower" (the essence of lead), while fire represents "true mercury" (the essence of quicksilver). When gold and mercury combine, it is like water pouring into fire—this harmonization does not require deliberate positioning of the elements above or below.

The sun and moon (symbolizing Yin and Yang) interact dynamically, a state often observed between the last and first days of the lunar month. The sun represents mercury, while the moon represents gold; the waxing and waning of the alchemical fire must be observed over this monthly cycle. The new moon (Shuo) marks the beginning of the month, while the dark moon (Hui) marks its end—this is when Yin and Yang alternate and clash. When water energy is strong (as represented by the Kan trigram, symbolizing water and the moon), Yang energy is eroded. When fire energy weakens (as represented by the Li trigram, symbolizing fire and the sun), even daylight dims. The Qian trigram embodies the vigorous Yang of dawn, while the Kun trigram embodies the yielding Yin of dusk.

"Names" define essence, while "terms" describe characteristics. Mercury (quicksilver) originates from the sun, containing hues of gold and vermilion—hence it is called "cinnabar" (Dan). It flows like water yet gleams like silver, thus also being named "water silver" (shuiyin). When metal returns to its original nature, it can be refined into the "returned elixir" (Huandan). The essence of mercury is metallic, "Dan" refers to its redness, and "return" signifies restoration. Through refinement, mercury transforms into cinnabar, which is then further refined into the elixir—this is the process of "returning the elixir." Both external alchemy (ingesting elixirs) and internal alchemy (inner cultivation) must be practiced together. External alchemy helps one return to primordial Qi, while internal alchemy involves "returning the essence to nourish the brain" (a Daoist technique)—only through their combined practice can longevity be achieved.

The author, Master Xu, humbly states that when recording the methods of the "Great Returned Elixir" from the Dragon-Tiger Scripture, he dared not presumptuously imitate the literary style of sages. In alchemy, "dragon and tiger" carry multiple meanings: the golden flower (lead) symbolizes the tiger, while golden mercury (quicksilver) symbolizes the dragon. Cinnabar is called the "red dragon," and mercury is called the "white tiger." Mercury, being both the essence of wood (green dragon) and appearing silvery-white (white tiger), means that the golden flower (lead) also bears the names of dragon and tiger. If lead and mercury are not combined correctly, the Golden Elixir (Jindan) cannot be achieved.

This passage elucidates the symbolic meaning and practical application of "Dragon and Tiger" in alchemical practice. It explains that during neidan (internal alchemy) refinement, golden flowers (metal oxides) symbolize the Tiger while mercury represents the Dragon—these two substances being crucial materials for elixir preparation. Without these treasures, the golden elixir (jindan) cannot be successfully concocted. Though realgar and azurite (two minerals) may serve auxiliary functions, their primary roles are limited to coloration and supplementary effects.

The Yellow Emperor particularly valued golden flowers because while mercury's volatile nature makes it difficult to control, golden flowers—being compounds of lead and mercury—share mercury's origin while possessing metallic properties that enable them to absorb and react with mercury. The scripture details the production method: premium-grade lead must be repeatedly calcined in intense flames to remove impurities before combining with mercury, yielding iridescent golden flowers known as "Heaven-Earth talismans" or "flowing pearl blossoms."

The specific alchemical procedure involves grinding golden flowers and mercury in a 1:1 ratio into powder, then placing it in the alchemical cauldron. Either yellow spume (a mineral) or directly prepared golden flower paste may coat the cauldron's interior before sealing it with mercury for a month-long incubation. Each subsequent month requires proportional additions of fresh mercury. After a hundred days, nine-cycle lead sand continues the cultivation until the elixir manifests golden-red hues. Notably, earthenware cauldrons require no water treatment, whereas iron cauldrons need special tempering to soften them. For earthen cauldrons, a mixture of sweet earth, yellow clay slurry, and Shouzhou porcelain powder proves ideal for construction.

This scripture primarily details the practical methods and material processing in Daoist alchemical practices. When refining the elixir, first grind lead and cinnabar into a paste-like consistency to coat the container, then gradually heat it until glowing red-hot before adding the prepared medicinal ingredients. The entire refining process requires precise fire control—starting with gentle heat (wenhuo, "civil fire") and gradually transitioning to intense heat (wuhuo, "military fire")—lasting approximately 150 days.

The text describes the method for creating "Zhengyang Dan" (True Yang Elixir): mixing lead and mercury in a one-to-one ratio, then refining continuously from the winter solstice for an entire year while carefully regulating the heat, culminating in a final week of intense firing. It also introduces two distinct alchemical methods—"Yinyuan Fa" (Yin Origin Method) and "Yangyuan Fa" (Yang Origin Method)—the latter using cinnabar and yellow lead as primary materials.

Particular emphasis is placed on the importance of "Jinhua" (Golden Flowers, a special substance produced during alchemical processes), which both the Yellow Emperor and Prince Huainan valued highly. Liu An, the Prince of Huainan (a Han dynasty nobleman devoted to Daoist cultivation), refined Jinhua with lead and cinnabar for a hundred days to produce what he termed "Qiushi" (Autumn Stone—named for its association with the west, which corresponds to autumn in the Five Phases system). The author refutes contemporary claims that Qiushi was actually arsenopyrite (a toxic mineral), clarifying that arsenopyrite was only used when refining the "Four Divine and Eight Mineral Elixir" or for drying mercury.

The passage concludes by explaining that Liu An derived his title from his fiefdom in Huainan. His devotion to Daoist practice led to legends of receiving teachings from the Eight Immortals, eventually causing him to renounce his princely status to pursue immortality. This text reflects the concrete practices of ancient Daoist alchemy and its understanding of alchemical materials.

This passage explains the ancient alchemical method of refining "Yellow Teeth" (Huangya) and its associated theories. To this day, remnants of elixir-making can still be found on Mount Bagong in Shouzhou (present-day Shouxian County, Anhui).

The so-called "Wangyang (pure Yang medicine) combined with Yellow Teeth" refers to a substance refined from lead and yellow lead oxide (also called capital cinnabar). The specific method involves mixing one jin of yellow lead oxide with four liang of mercury in a porcelain bowl from Shouzhou, then calcining it over intense heat for about the duration of a meal. This produces a mirror-like liquid that solidifies upon cooling into a golden yellow substance. When broken, its cross-section resembles horse teeth, hence the name "Yellow Teeth." While refining the golden flower autumn stone (a pure Yang medicine called Wangyang) proves difficult, processing yellow lead oxide is comparatively easier.

Some contemporaries mistakenly equated golden flowers with Yellow Teeth, though they differ slightly. Others erroneously added sulfur, orpiment, and realgar to the mixture. It's crucial to understand that combining sulfur with mercury only produces cinnabar, entirely distinct from Yellow Teeth. The Ten Immortals Record mentions that Yellow Teeth can also be made from lead, mercury, chalcanthite, and yellow vitriol, but this classic maintains that the orthodox method uses only lead and yellow lead oxide.

During the Han Dynasty, a governor of Yi Province who admired Daoist cultivation frequently used alchemy to help others, thus promoting this Yellow Teeth method. In truth, mastering lead preparation alone could produce the Great Returned Elixir (the highest-grade Daoist elixir).

True master alchemists could practice "solitary refinement" (working alone), while ordinary practitioners required the assistance of "mother elixirs" (golden flowers). Ancient perfected beings used only mercury, patiently cultivating it with fire regulation over years before combining it with azurite (a mineral medicine). Modern practitioners, unable to match ancient attainments, must supplement their work with golden flowers and Yellow Teeth to succeed.

The Nine Elixirs Scripture records that golden flowers should coat the alchemical vessel to nurture mercury—one must never refine mercury in an empty crucible. The so-called "Yin-Yang dragon-tiger" pairing (referring to medicinal combinations) requires precise formulation. Elixirs refined alone are called "isolated Yang." The Nine Primordial Sovereigns (Daoist deities) warned that such elixirs cannot be ingested directly but must be balanced with Yin medicines. Lead belongs to Water and mercury to Fire—only by using Water to control Fire can one produce non-toxic elixirs.

Some successfully refined dry mercury appears like red glass, truly exceptional in this world. However, practitioners must note that solitary-refined elixirs first exhibit cold properties, then transform into heat during completion, developing toxicity.

This passage elucidates the core principles of Waidan (external alchemy), the Daoist practice of compounding mineral-based elixirs for longevity. When medicinal powders are refined into an ointment and consumed in five-ounce doses, one experiences a chilling sensation in the bone marrow. Yet this merely resembles chronic mercury consumption like a long-term illness—the resulting silver vessels remain worldly treasures, far from conferring immortality.

The true secret of alchemy lies in the harmonization of Yin-Yang through the "dragon-tiger congress" (where dragon symbolizes mercury and tiger represents lead, embodying complementary forces). How could transformation rely solely on mercury? Thus, the process requires mercury as the primary agent, "golden flowers" (the essence of lead) as the sovereign ingredient, supplemented by azurite (a mineral pigment) and reinforced with realgar (a medicinal mineral). When sovereign and ministerial ingredients interact synergistically, their toxicity is transmuted and neutralized. The completed elixir, when ingested, spreads through the body like wind and rain, instantly nourishing bones and connecting sinews—this is the foundation of immortality.

The cosmic operation follows this pattern: Heaven embodies Yang, Earth embodies Yin; the sun is Yang, the moon is Yin. The interplay of these complementary forces constitutes the Dao—only through the mutual transformation of these two energies can all things be generated, as neither can exist alone. Just as one cannot have heaven without earth or sun without moon, alchemical success requires the complete participation of lead, mercury, realgar, and azurite. Paradoxically, the most precious elixir emerges when realgar and azurite are omitted.

Ancient and modern alchemy share this universal principle: the essential alchemical transformation occurs through lead-mercury interaction. The proportions between "golden flowers" (lead essence) and mercury must be perfectly balanced—this truth is unequivocal. Seekers of the Dao should redouble their efforts to contemplate these essentials—my words are utterly transparent, devoid of deception.

These revealed methods and scriptures warrant profound reflection, containing not a single falsehood. Whereas past teachings emphasized virtue cultivation, contemporary practice demands greater emphasis on application. Through the alchemical functions of lead essence and "yellow sprouts" (the nascent form of the elixir), one ultimately achieves the Great Return Elixir capable of reversing aging.