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Coal tar is a brown or black liquid of high viscosity, which smells of naphthalene and aromatic hydrocarbons. Coal tar is among the by-products when coal is carbonized to make coke or gasified to make coal gas. Coal tars are complex and variable mixtures of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds.
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Coal tar n. A viscous black liquid containing numerous organic compounds that is obtained by the destructive distillation of coal and that has many [more]Balnetar - Community and Resources