乃粪窑中多年砖也。取起一块，洗净，以清水煎熬，撇去浮沫，候浮沫净，其汁亦浓，
每一
二盏，治痘不贯浆。虚弱无力者。大效。
乃粪坑中蛆钻之泥，其质松，凡蛆在泥中过冬，必钻此土作窠。蛆过冬则短缩，头生二
角，
白如蛹，清明后化黑虫而去。蛆必退壳，每退每大。其退时，辄扒越墙石从高坠下，退一节
，再扒再坠，如是屡次，则全退矣。此泥有涌，故入退管药用。须冬时取。
治痔漏多年起管∶ 用蛆钻泥一斗，晒干，以五升炒热，袋盛，令患者去裤坐其上，则
稠水
浓血淋下。久之泥冷，再用五升炒热接盛坐之。如此一袋坐，一袋复炒泥，炒热又易，换数
次，则稠脓自尽，三度后管自退出。又不伤人，屡用屡效之方也。
（十一种 附五种）
色黑，产广中，以香炷点之，有烟起如蚊子飞者真。陈廷庆云∶色白者真，此乃熔铁锅
中浮
治癣神效∶多年顽癣久不愈者，先以姜擦患处，后以粉付之。 百草镜云∶用醋调搽，
忌姜
椒一切发物。 杨春涯验方云∶广东剔癣粉治癣神效。其色如沉香末，则是铁线者，乃剔癣
之讹也。
两腿阴面湿癣∶毛世洪经验集∶以荸荠蘸铁线粉擦之立瘥（铁线粉，即火炮中刮下销粉
也）。
粤中洋行有舶上铁丝，带来出售中土，日久起销，用刀刮其销，明亮如新，所刮下之销末，
名铁线粉。其色黄如香灰，带白色者，乃熔铁浮起锅中白沫捣细而成。亦名铁线粉。广中有
此二种。
This is brick accumulated in a latrine for many years. Take one piece, wash it clean, and decoct it with clear water. Skim off the floating foam. When the foam is cleared and the liquid becomes thick, take one or two cups each time to treat smallpox that fails to form pustules. It is highly effective for those who are weak and lack strength.
This is mud drilled by maggots in a cesspit; its texture is loose. Maggots overwintering in the mud must drill into this soil to make nests. During winter, the maggots shrink, develop two horn-like protrusions on their heads, become white like pupae, and transform into black insects that fly away after the Qingming Festival. Maggots must shed their skins to grow larger with each molt. When shedding, they often climb wall stones and fall from heights. After shedding one segment of skin, they climb again and fall again, repeating this process several times until fully shed. This mud has a property of drawing out pus, so it is included in medicines for expelling fistula tracts. It must be collected in winter.
Treatment for chronic hemorrhoidal fistulas forming tracts: Use one *dou* (approx. 10 liters) of maggot-drilled mud. Dry it, then stir-fry five *sheng* (approx. 5 liters) until hot, place it in a bag, and have the patient sit on it without trousers. Thick fluid and blood will drip out. When the mud cools down, stir-fry another five *sheng* to replace it. Repeat this cycle of sitting on one bag while heating another several times. The thick pus will be completely discharged, and the tract will naturally detach after three sessions. This method does not harm the body and is a frequently used, highly effective prescription.
(Total eleven types, with five appended)
Black in color, produced in central Guangdong. If lit with incense, smoke rises resembling flying mosquitoes; this is genuine. Chen Tingqing stated: White in color is genuine; this is the scum floating in an iron melting pot...
Divine efficacy in treating tinea: For chronic, stubborn tinea that has persisted for years and resisted treatment, first rub the affected area with ginger, then apply the powder. *Baicao Jing* records: Mix with vinegar and apply externally. Avoid ginger, pepper, and all stimulating foods. Yang Chunya's verified prescription records: Guangdong "Tixuan" powder is divinely effective for tinea. Its color resembles agarwood powder; this is Iron Wire Powder, a misnomer for "Tixuan" (Scraping Tinea).
Damp tinea on the inner aspect of both legs: Mao Shihong's Experience Collection records: Dip water chestnut (*Heleboreus Bulbus*) in Iron Wire Powder and rub the affected area; cure is immediate. (Iron Wire Powder refers to the rust scraped from cannons.)
In Guangdong, foreign trading houses imported iron wires which were sold in China. Over time, they rusted. Using a knife to scrape the rust yields a bright, new-looking surface. The scraped rust powder is named Iron Wire Powder. Its color is yellow like incense ash; the white variety is made by grinding fine the white foam floating up in iron melting pots. It is also named Iron Wire Powder. There are two types of this in Guangdong.