Coal tar
Coal tar is a viscous dark liquid that is a by-product of deriving coke and coal gas from coal. Coal tar has long been a source of useful chemicals as well as a general wood preservative.
Coal tar is a viscous dark liquid that is a by-product of deriving coke and coal gas from coal. Coal tar has long been a source of useful chemicals as well as a general wood preservative.
Coal tar is a viscous dark liquid that is a by-product of deriving coke and coal gas from coal. Coal tar has long been a source of useful chemicals as well as a general wood preservative.
Source: Wikipedia "Coal tar" · CC BY-SA 4.0
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