coal tar A thick, black, tarry liquid, obtained by the distillation
of bituminous coal in the manufacture of illuminating gas; used for
making printer's ink, black varnish, etc. It is a complex mixture from
which many substances have been obtained, especially hydrocarbons of
the benzene or aromatic series.
coal tar A brown or black liquid of high viscosity consisting of a mixture of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds.
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