The Coal tar reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Coal tar

Coal tar is the liquid by-product of the distillation of coal to make coke. The gaseous by-product produced by this process is commonly known as town gas.

Coal tar is very viscous and strong smelling. It can be made into coal tar soap, and is used in medicated shampoo to kill and repel head lice and as a treatment for dandruff and psoriasis.

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