https://www.verywellhealth.com/coal-tar-products-for-psoriasis-2788383
Coal tar has been used to treat skin conditions for more than a century. Learn the benefits, risks, and side effects of coal tar in treating psoriasis.
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https://www.cdc.gov/niosh/idlh/8030306.html
the revised IDLH for coal tar naphtha is 1,000 ppm based strictly on safety considerations (i.e., being 10% of the lower explosive limits of the various...
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https://newsroom.uw.edu/blog/why-dot-your-skin-chemical-found-coal-tar
Black henna drawings on skin are associated with rashes and blistering
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