"coal tar." YourDictionary, n.d. Web. 15 September 2018. <http://www.yourdictionary.com/coal-tar>.
coal tar. (n.d.). Retrieved September 15th, 2018, from http://www.yourdictionary.com/coal-tar
A viscous black liquid containing numerous organic compounds that is obtained by the destructive distillation of coal and used as a roofing, waterproofing, and insulating compound and as a raw material for many dyes, drugs, and paints.
Coal-tar salves can help relieve symptoms of nummular dermatitis that have not responded to other treatments, but these ointments have an unpleasant odor and stain clothing.
Ichthammol is a coal-tar derivative, and while natural in origin, is not an herbal remedy.
Coal-tar shampoos may be used for seborrheic dermatitis that occurs on the scalp.
Japp, in the Kekule memorial lecture he delivered before the London Chemical Society on the 15th of December 1897, declared that three-fourths of modern organic chemistry is directly or indirectly the product of Kekule's benzene theory, and that without its guidance and inspiration the industries of the coal-tar colours and artificial therapeutic agents in their present form and extension would have been inconceivable.
Ten volumes of the purest coal-tar benzene were shaken for four hours with one volume of sulphuric acid, the acid layer was removed and neutralized with lead carbonate, and the lead thiophen sulphonate obtained was distilled with an equivalent quantity of ammonium chloride.