TCM WikiHard charcoal2016-09-23Hard charcoal 1 # Name Bai Tan (Hard charcoal) 白炭Bai Tan The Effect of Hard charcoal Indications Scalds, hematochezia, eczema of scrotum. Dosage and Administrations It is made into pills and powder for oral taking. Proper dosage is for external application, pounded for applying or decocted for washing.