Dark hair dyes: They are known to contain coal tar, a carcinogenic chemical.

—深色染发剂：已被证明含有致癌化学物质煤焦油。

youdao

Dark hair dyes: They are known to contain coal tar, a carcinogenic chemical.

—深色染发剂：已被证明含有致癌化学物质煤焦油。

youdao