味辛，气温。无毒。即灶中对釜底心黄土，取年深色变褐者为良。醋调或蒜捣泥
，涂消痈肿毒瓦斯。和水敷脐勤换，辟除时疫安胎。疗中风不语心烦，止崩中吐血咳逆。并有
捣细，调水服之。又有百草霜，名锅底墨。血部要剂，因黑胜红。慎勿涂疮，入肉如
印。仍
有灶突黑者，亦灶额上黑煤。曾载方书，总能止血。
气温。无毒。惟取东壁陈土，因得晓日久烘。（或问曰∶东壁土得晓日烘炙为优。
南壁土亦午日常烘炙者，何弃而不取乎？答曰∶《素问》云∶少火之气壮，壮火之气衰。日
者，太阳真火也。日初出，是少火。少则壮，故取之。及当午，壮火也。壮则衰，故不取。
）务择多年，（百余年者妙。）研罗细末。扶脾益胃，以类相从。（脾胃属土故云。）和白术炒
成，
专止注泻；同蚬壳研就，能敷痘疮。点翳侵目中，摩癣发身上。治春月寒热瘟疟，去下部痔
脱肛。故鞋底土研水吞。适他方，不服水土者立效；（取自己穿者良。）
铸钟黄土研酒服，
卒心痛，疰忤恶气者殊功。鼠壤土主中风筋骨挛疼，日曝干用。燕窠土（胡燕者良。）
治风瘙
瘾疹 痒，水调湿敷。
味辛，气温。性烈有毒。在处近山俱得，造窑烧石而成。种有精粗，用须选择。以水
沃，热蒸解者力劣；置风吹，自裂解者力优。能伏硫黄，堪去锡晕。凡使醋浸一宿，漉出
待干研成。纳牛黄胆阴干，敷刀斧伤止血。和白糯米蒸透，点疣痣子去根。同诸灰淋汁熬
膏，决痈肿破头开口。产妇阴不合，煎水洗即收。造酒味带酸，投少许便解。堕胎甚捷
，辟虫尤灵。 又种炉内冬灰，系荻蒿藜 者。因冬寒不断其火，取性气烈过三时。入剂用
之
，得此为胜。熬膏蚀肉，专理外科。灶内热灰，醋调作饼。心腹冷痛，频熨弥佳。
\x百草灰
端午多收，（此日乘露采草一百种，阴干烧成。）两腋臭用治即止。（井花水调灰成团，曝干
。重烧令白，酽醋和为饼，两腋下紧紧夹之。当抽一身痛闷疮出即愈。以少水便洗之，不过
三两度。）
[Fulonggan (Dragon's Liver)]
Pungent in flavor, warm in nature. Non-toxic. It is the yellow earth from the center of the stove bottom facing the pot. The best quality is selected for its deep color and brownish hue. Mixed with vinegar or pounded garlic into a paste, it is applied to eliminate carbuncles, swelling, and toxic vapors. Applied as a water-based poultice on the umbilicus and changed frequently, it wards off seasonal epidemics and calms the fetus. It treats aphasia due to wind-stroke, irritability, stops metrorrhagia, hematemesis, and coughing upward. It can also be finely pounded and taken with water.
There is also Baicaoshuang (Soot from Hundred Herbs), named Guodimo (Pot Bottom Ink). It is an essential agent for treating blood disorders, because black overcomes red (blood). Do not apply it to sores, as it will leave marks like seals when entering the flesh. There is also the black soot from the chimney flue, which is also the black coal on the stove front. Recorded in medical texts, it can generally stop bleeding.
[Dongbitu (East Wall Earth)]
Warm in nature. Non-toxic. Only select aged earth from the east wall, because it has been baked by the morning sun for a long time. (A question arises: Dongbitu is superior due to morning sun baking. Nanbitu (South Wall Earth) is also baked by the noon sun daily; why is it discarded? Answer: Suwen states: "The qi of Shaohuo (Lesser Fire) is vigorous, while the qi of Zhuanghuo (Excessive Fire) declines." The sun is the true fire of Taiyang. At sunrise, it is Shaohuo. Being lesser, it becomes vigorous, hence it is selected. By noon, it is Zhuanghuo. Being excessive, it declines, hence it is not selected.) One must select earth that has been there for many years (hundreds of years are excellent), grind and sieve it into fine powder. It supports the Spleen and benefits the Stomach, based on the principle of "like attracts like" (since Spleen and Stomach belong to Earth). Stir-fried with Baizhu (Atractylodis Rhizoma), it specifically stops chronic diarrhea; ground together with Xianqiao (Clam Shell), it can treat smallpox sores. Applied to remove eye pterygium, rubbed to treat body tinea. It treats spring fevers, colds, plagues, and malaria, and removes lower body hemorrhoids and rectal prolapse. Therefore, earth from shoe soles, ground and swallowed with water, is effective for those suffering from unfamiliar terrain sickness (acclimatization issues) in other places (using one's own worn shoe sole is best). Yellow earth used for casting bells, ground and taken with wine, shows remarkable merit for sudden heart pain and Zhwu evil qi. Shurangtu (Mouse Hole Earth) treats wind-stroke causing muscle and bone spasms and pain; use after sun-drying. Yanketu (Swallow Nest Earth) (from wild swallows is best) treats Fengsao Yin zhen (wind-induced urticaria/itching); mix with water for wet application.
[Duan Shi (Calcined Stone/Lye)]
Pungent in flavor, warm in nature. Acrid and toxic. Available near mountains everywhere, produced by kiln firing of stones. Varieties range from refined to coarse, requiring careful selection. Those decomposed by water irrigation and heat steam have inferior potency; those decomposed by natural cracking under wind exposure have superior potency. It can fix Sulphur and remove tin tarnish. When used, soak in vinegar overnight, drain, dry, and grind into powder. Mixed with Niuhuang (Calculus Bovis) and Dan Yin (Bile) and dried in shade, it stops bleeding from knife and axe wounds. Steamed thoroughly with Bai Nuomi (White Glutinous Rice) and applied, it removes warts and moles at the root. Mixed with ashes, leached juice, and boiled into ointment, it breaks open abscesses and boils. For postpartum vaginal laxity, decocted wash promotes contraction. In brewing, if the taste is sour, adding a little resolves it. It induces abortion very quickly and expels parasites with great efficacy. Another type is Donghui (Winter Ash) from the furnace, made from Di, Hao, and Li plants. Because the fire is kept burning continuously during winter cold, its acrid and hot nature exceeds that of the other three seasons. Used in prescriptions, this type is superior. Boiled into ointment to erode flesh, it specializes in surgical treatments. Hot ash from the stove, mixed with vinegar into cakes, is good for frequent warming compresses for cold pain in the heart and abdomen.
[Baicao Hui (Hundred Herbs Ash)]
Collected abundantly during the Dragon Boat Festival (on this day, collect one hundred types of herbs while dewy, dry them in shade, and burn them into ash). Stops axillary odor immediately. (Mix ash with Jinghua Shui (Well Water) into a ball, dry in sun. Re-burn until white, mix with strong vinegar into a cake, clamp tightly between both armpits. When a painful, stifling rash erupts from the whole body, it heals. Wash with a little water; no more than two or three times needed.)