from the U.S. Federal Government, issued in 1980, and remains a cancer concern due to the presence of benzene in coal tar skincare products, such as shampoos.

History

Coal tar was discovered circa 1665. Much later, it was an undesirable byproduct in the production of coke and illumination gases ("town gas"). Soon it was found that the tar could be a source of solvents. Around 1850, it was discovered that it could be used

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