—深色染发剂：已被证明含有致癌化学物质煤焦油。
Dark hair dyes: They are known to contain coal tar, a carcinogenic chemical.
煤焦油瓷漆具有优良的物理化学性能和稳定的防腐性能，而且原料来源广，价格低廉，近生来又开始在我国管道防腐中应用。
Coal tar coating has been used as the material for corrosion prevention for its good stable physical and chemical properties which has a large range of raw material resource and low price.
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