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Coal tarCoal 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. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Coal tar".