焦油
焦油老早称溚（英语：tar），是一种黑色个粘稠液体，是有机物经过加热干馏个产物，常看到个是用煤炼焦产生个煤焦油，但木材干馏也会产生木焦油，此外泥炭干馏，石油分馏产生个重油也被称为焦油。焦油可做为防腐剂。
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