1, the residual carbon in blood is flat and bitter, and it belongs to the liver meridian and stomach meridian. Has astringent, hemostatic, blood stasis removing, and diuretic effects. Can be used for treating various bleeding symptoms, such as hemoptysis, hematemesis, epistaxis, bloody stranguria, hematuria, metrorrhagia, hemorrhoid, etc. It can be decocted or ground for external use. It can also treat dysuria and so on.

2, blood charcoal, Chinese medicine name. Charcoal made of human hair Take wool, remove impurities, wash oil stains with alkali, rinse with clear water, dry in the sun, stew and burn into charcoal, and let cool.