Rasaprakāśasudhākara

Wrap it in three layers of birch bark, and subsequently, bind it into a bundle with cloth and steam it in the juice of lemons. (77)
Steam it carefully for three yama three-hour periods; a total of nine hours. Afterward, wash it with cow’s urine. Then, let the intelligent practitioner cook it through many puṭa heat treatment cycles in an earthen pit while contained inside the fruit of the dhurta Datura metel/thorn apple. (78)
It is called lavaka a specific medicinal processing method. It becomes beautiful and radiant like the sun. There is no doubt here that once bound, it becomes equal to Shiva the Lord of transformation. (79)

The wise practitioner should grind mercury with one-eighth part silver, creating a paste using the juice of cāṅgerī wood sorrel. (80)
Bind the mercury amalgam khoṭa a solid mass of mercury and cook it for three days in the oils of dhurta Datura. Similarly, cook it in the oils of kaṅguṇī foxtail millet and the root of karavīra oleander. (81)
Cook it also with the oils derived from nutmeg, monkshood (vatsanābha), bhṛṅgī a medicinal herb, and samudraśoṣaka sea-absorber plant. (82)
The wise physician should also cook it with deodar cedar oil. Afterward, add very sharp madirā fermented spirit/liquor and apply fire fueled by chaff. (83)
By keeping it closed for seven days, a mukha mouth/opening, referring to the reactive state of the mercury is certainly produced. It effectively acts as a restrainer of semen; one who consumes it with milk shall succeed, not otherwise. (84)

In a wide iron vessel, create a small basin for tuttha copper sulfate. Place well-purified mercury into it in the correct proportion. (85)
Cover it with powdered tuttha and fill the vessel with lemon juice. Seal the mouth of the iron vessel carefully with a lid. (86)
Place it in a windless, secluded place for three days. Afterward, the physician should wash it many times using heated sour gruel (kāñjika). (87)
The color of the mercury appears like fresh butter. Bind it into a small bundle and steam it in sour gruel. (88)

Having placed it in the center of a particle of limestone powder (aśmacūrṇa), sprinkle it with water. Once it has cooled, extract it. (89)
One should certainly cook it three times following this very method. It attains hardness, truly, just as the words of the teacher declare. (90)
Then, cook it with one thousand fruits of the dhurta Datura. A mukha reactive opening is properly produced; it is fully capable of restraining seminal discharge. (91)

Take equal parts of tin and steel and melt them together in a diamond-crucible. Carefully separate the tin and steel using intense charcoal heat. (92)
Repeat this process three times until it becomes thin. The base-metal seed (bīja) should be one śāṇa a small unit of weight while the mercury should be one pala a larger unit of weight. (93)
Grind it with the juice of gold-colored plants for one day and let it dry. A heat treatment (steaming) of the ball must be performed for seven days. (94)
The intelligent practitioner should steam it for nine hours in a decoction of triphalā the three myrobalan fruits. Steam it likewise with the juice of kumārī aloe vera and the juice of bhṛṅgarāja false daisy. (95)
Steam it for three days with the juice of bhṛṅgī as well. After processing it with each of these medicinal substances, place it into a glass bottle. (96)
Seal the opening by applying a paste of clay and fabric. Dig a pit measuring three cubits and fill it with dried cow-dung cakes. (97)
Place the glass bottle filled with spirits in the center. After two months, extract it from the earth. (98)
The excellent mercury thus bound must be taken; it is white and resembles the luster of the moon. It creates a mukhastha a state of perfected reactive affinity and creates a body as hard as a diamond. (99)
One may consort with a hundred women, yet remain free from the signs of aging such as wrinkles and gray hair. According to the science of the Goddess, this is the mercury bound with metal. (100)

1. Limestone powder refers to the calcined substance of shell or stone. 2. One should reduce it to ash and extract it. 3. "Juice of garlic" is mentioned in some manuscripts. 4. Shiva refers to the Harītaki fruit. 5. Filled with cow-dung cakes refers to the dung of cows or horses.