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Mercuric chloride powder, also known as mercury powder or greasy powder.
It is incompatible with Shihuang (Realgar) and Cishi (Magnetite). It is contraindicated in all blood disorders.
Pungent, warm and drying. Highly toxic. It expels phlegm and saliva, removes dampness and water retention. It treats sores and kills parasites. It should not be taken lightly. When mixed with fresh ginger juice for external application, it leaves no scars even if the skin is scratched open. Mixed with rock sugar, formed into pills the size of hemp seeds, one pill taken on an empty stomach with rice decoction treats children who eat dirt. Mixed with Huangdan (Red Lead Oxide) into powder, it treats corneal opacity arising from smallpox. (If the left eye is affected, blow powder into the right ear; if the right eye is affected, blow powder into the left ear, and it will recede.) It is made by sublimating mercury, alum, and common salt into powder. If used improperly, its toxic qi enters the bones and cannot be expelled.

Pungent, warm. Toxic. Kills parasites and expels phlegm. Made from refined mercury. It causes ulcerated gums and tendon spasms, more severely than Qinfen (Calomel).

Also known as Huangjins Shi (Gold Stone).
It is incompatible with Nanxing (Arisaema Cum Bile), Dihuang (Rehmanniae Radix Praeparata), Woju (Lactuca Sativa), Diyü (Sanguisorbae Radix), Huangqin (Scutellariae Radix), Baizhi (Angelicae Dahuricae Radix), Danggui (Angelicae Sinensis Radix), Dijin (Polygoni Avicularis Herba), Kushen (Sophorae Flavescentis Radix), Wujia Pi (Acanthopanacis Cortex), Ziheche (Placenta Hominis), Wuyeteng (Gynostemmae Caulis), Echangcao (Portulacae Herba), Jichangcao (Portulacae Herba), Ebushicao (Centipedae Herba), Sangye (Mori Folium), and Zhi (Animal Fat).
Bitter, warm. Toxic. Enters the Yang aspect of the Liver Meridian, obtaining the essence of Yang Earth. It searches out Liver Qi, drains Liver Wind. It resolves hundred toxins, treats malignant sores, removes dead flesh, treats convulsions and epilepsy, eliminates malaria and dysentery, dissipates phlegm accumulation, and kills various parasites. With Huai Zao (Jujube) pitted and stuffed with Xionghuang (Realgar), wrapped and burned over a lamp until turned to ash, this powder is applied to treat Gangrenous Stomatitis (Zouma Yagan). Mixed with water and taken orally (5 qian), it treats "Fa Zheng" caused by drinking oil. Combined with Heiqian (Black Lead), it treats bleeding from the anus due to Yin binding. Mixed with Jingjie Sui (Schizonepeta Spike) powder, it treats tongue stiffness due to wind-stroke. Mixed with Liuhuang (Sulfur) and Shuifen (Calomel), adjusted with colostrum, applied to the red nose tip. Mixed with Baizhi powder and taken with wine, it treats tetanus. Mixed with Qingdai (Indigo Naturalis) powder and taken with water, it treats food poisoning. Mixed with Baifan (Alum) and Gancao (Licorice Root), soaked to treat severe scrotal swelling like a bean pod. Mixed with Zicao (Arnebiae Radix et Rhizoma) powder, adjusted with carmine juice, applied to smallpox carbuncles. (First puncture with a silver knife, then apply; extremely effective.) Mixed with Chansu (Toad Venom), green onion, and honey, pounded and applied to treat malignant carbuncles. Mixed with Xixin (Asari Radix et Rhizoma) into powder and blown into the nose, it treats hemi-crania. (If pain is on the left, blow into the right; if on the right, blow into the left.) Mixed with Zhusha (Cinnabar), adjusted with pig heart blood and taken orally, it treats epilepsy. The best quality is red like a rooster's comb, clear and transparent, without odor. Boil in rice vinegar with radish juice until dry before use. Strange case: If there are worms moving under the skin, sounding like a child crying, this is transformed muscle and flesh. Mix with Leiwan (Wormwood Fruit) each 1 liang, grind into powder, sprinkle on pork slices, roast thoroughly and take regularly; it will heal spontaneously.