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Select large-sized *Fuzi* (Prepared Aconite Root, *Aconiti Lateralis Radix Praeparata*), soak them in urine from an uncircumcised boy to a depth of three cun. Change the urine daily, soaking for three months in summer and five months in winter. Then change to fresh urine again, and boil until the "two fragrances" (referring to specific aromatic compounds or stages of processing) are exhausted.

Remove the skin and umbilical scar, thread them with string, and dry in the shade, or sun-dry is also acceptable. Store for future use.

*Kongqing* (Azurite, *Cupri Carbonas*) is a divine medicine for eye drops. Naturally occurring ones are extremely difficult to obtain; now they can be artificially cultivated, and their efficacy is no different from natural ones. The prescription is as follows:
*Bopiao* (Mirabilite, *Natrii Sulfas*) half qian, *Bajili* (Tribulus Fruit, *Tribuli Fructus*) and *Longdancao* (Gentian Root, *Gentianae Radix*) each one fen, *Xianlingpi Ye* (Epimedium Leaf, *Epimedii Folium*) and *Xuanjinhua* (Inula Flower, *Inulae Flos*) each one qian.
Grind all ingredients into powder. Take a piece of yellow mud the size of a fist, mix evenly with the medicine, add water to adjust the consistency like soft rice, and form into earthen cakes. Use five Taiping Tongbao copper coins, arrange them according to the Five Directions (East, South, West, North, Center). On the smooth side of the coins, inscribe the characters Gold, Wood, Water, Fire, and Earth. Place the coins with the inscribed side down and the coin face up, arranged according to the Five Directions. Place sand grains the size of beans, four pieces per coin, into the gaps of the five characters. This must be placed on dry yellow earth, aligned with the earthen cake. Cover with a new clay pot, then cover the pot with dry yellow earth. In winter, process for ten days; in summer, for five days. Remove and harvest from the coins. Grind finely for medicinal use. The processing must not be too old (over-processed) nor too tender (under-processed), but must be just right.

This product can strengthen Yin and benefit Yang, unblock all joints, open the nine orifices, tonify deficiency and fatigue, promote lactation. Taking it causes a sudden surge of Yang Qi, doubles food intake, and makes the physique robust and vigorous. For selection, regardless of thickness, only those with bright, clean, and lustrous color are suitable for refining. Those with yellow or red colors are unsuitable. During refining, place one jin of the material in a gold or silver vessel. Place this vessel inside a large cauldron filled with water, ensuring the vessel is submerged. Boil maintaining a gentle simmer like fish eyes bubbling, adding water as it evaporates. If the material is thin powder, boil for three days and nights; if it is雁齿 (goose-tooth shaped) or thick/fatty stalactites, boil for seven days and nights. Wait until the color turns yellowish-white, indicating it is ready. If unsure if it is raw, continue boiling; ten days total is ideal. After boiling, remove from the gold/silver vessel. The water in the cauldron will become yellow and turbid; discard it, do not let anyone consume it. Add clear water back into the inner vessel, boil for about half a day, then remove. The water should remain clear; if it does not change color, stop. The stalactite is now non-toxic.