（《拾遗》）
【释名】铁衣。
藏器曰∶此铁上赤衣也，刮下用。
【主治】恶疮疥癣，和油涂之。蜘蛛虫咬，蒜磨涂之（藏器）。
平肝坠热，消疮肿、口舌疮。醋磨，涂蜈蚣咬（时珍）。
【发明】时珍曰∶按陶华云∶铁锈水和药服，性沉重，最能坠热开结有神也。
【附方】新八。
风瘙瘾疹∶锈铁磨水涂之。（《集简方》）
汤火伤疮∶青竹烧油，同铁锈搽之。（《积德堂方》）
疔肿初起∶多年土内锈钉，火 醋淬，刮下锈末，不论遍次， 取收之。每用少许，人
乳和，挑破敷之。仍炒研二钱，以齑水煎滚，待冷调服。（《普济方》）
脚腿红肿，热如火炙，俗名赤游风。用铁锈水涂解之。（《惠济方》）
重舌肿胀∶铁锈锁烧红，打下锈，研末。水调一钱，噙咽。（《生生编》）
小儿口疮∶铁锈末，水调敷之。（《集简方》）
内热遗精∶铁锈末，冷水服一钱，三服止。（《活人心统》）
妇人难产∶杂草烧镬锈、白芷等分。为末。每服一钱，童尿、米醋各半，和服见效。（《救
急方》）
（《拾遗》）
【释名】刀烟（《拾遗》）、刀油。
藏器曰∶以竹木 火，于刀斧刃上烧之，津出如漆者，是也。江东人多用之。
【主治】恶疮蚀 ，金疮毒物伤皮肉，止风水不入，入水不烂，手足皲坼，疮根结筋，
瘰毒肿，染髭发，令永黑，及热未凝时涂之，少顷当干硬。用之须防水。又杀虫立效（藏
器）。
【附方】新一。
项边 子∶以桃核于刀上烧烟熏之。（陈氏《本草》）
(From *Bencao Shiyi* [Supplement to Materia Medica])
**[Names]** Tieyi (Iron Coat).
Chen Cangqi stated: This is the red rust layer on the surface of iron, scraped off for use.
**[Indications]** Malignant sores, scabies, and tinea; apply mixed with oil. For spider or insect bites, apply crushed garlic juice (Chen Cangqi).
Calm Liver Qi, descend heat, reduce carbuncle swelling, and treat mouth and tongue ulcers. Grind with vinegar and apply to centipede bites (Li Shizhen).
**[Elucidation]** Li Shizhen said: According to Tao Hua, mixing rust with water and taking it orally has a heavy nature, effectively descending heat and resolving stagnation with remarkable efficacy.
**[Prescriptions]** Eight new prescriptions included.
Wind-induced urticaria (itchy wheals): Grind rusty iron into water and apply topically (*Jijian Fang*).
Scalds and burns: Mix oil obtained from burning green bamboo with iron rust and apply (*Jidetang Fang*).
Early-stage ding tumors: Take rusty nails buried in soil for many years, heat them over fire, quench in vinegar, scrape off the rust powder, collect regardless of quantity. Use a small amount mixed with human milk, pierce the lesion, and apply. Additionally, stir-fry and grind 2 qian (approx. 6g), boil in brine water, let cool, and take mixed (*Puji Fang*).
Redness and swelling of legs and feet, feeling hot as if roasted by fire, commonly known as "Chiyou Feng" (Red Roaming Wind). Apply iron rust water to relieve symptoms (*Huiji Fang*).
Double tongue swelling: Red-hot an iron lock, knock off the rust, grind into powder. Mix with water to make 1 qian (approx. 3g), hold in mouth and swallow (*Shengsheng Bian*).
Pediatric mouth ulcers: Iron rust powder, mix with water and apply (*Jijian Fang*).
Internal heat with nocturnal emission: Take 1 qian (approx. 3g) of iron rust powder with cold water; three doses will stop the condition (*Huoren Xintong*).
Dystocia in women: Equal parts of rust from a wok burned with weeds and Angelicae Dahuricae Radix (Baizhi). Grind into powder. Take 1 qian (approx. 3g) per dose, mixed with half a cup of child's urine and half a cup of rice vinegar for effective results (*Jiuji Fang*).
(From *Bencao Shiyi* [Supplement to Materia Medica])
**[Names]** Daoyan (Knife Smoke) (*Bencao Shiyi*), Daoyou (Knife Oil).
Chen Cangqi stated: It is produced by burning bamboo or wood to generate smoke, which condenses on the blade of knives or axes like lacquer. People in the Jiangdong region often use it.
**[Indications]** Malignant sores with erosion, skin and flesh injuries caused by toxic substances from metal wounds (Jinchuang), prevents invasion of wind-water pathogens, makes skin resistant to rotting when submerged in water, treats cracked hands and feet, resolves fibrous knots at sore bases, treats scrofula and toxic swellings, dyes beard and hair permanently black. When applied while hot and uncoagulated, it hardens quickly. Care must be taken to keep it dry. It also kills insects with immediate effect (Chen Cangqi).
**[Prescriptions]** One new prescription included.
Neck scrofula (cervical lymph node tuberculosis): Burn peach pits on a knife and fumigate the affected area with the smoke (Chen Shi *Bencao*).