A tar produced in the destructive distillation of bituminous coal. It is used as an ingredient in ointments for treating eczema, psoriasis, and other skin diseases.
Coal tar, a viscous and dark substance derived from the distillation of coal, finds frequent application as an ingredient in various ointments and medicated shampoos. These formulations are commonly prescribed for specific skin and scalp conditions, including psoriasis, certain types of dermatitis, and eczema.