Synthetic Colours
Coal-tar dyes are generally labelled as FD&C or D&C followed by a number. Carcinogenic.
When hair dyes first came out, the main ingredient in coal-tar hair dye caused allergic reactions in some people. Most hair dyes are now made from petroleum sources. But FDA still considers them to be coal-tar dyes.
 See also: MEA, Lipids, Silicone, Protein, Acid
  
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