In the summer of 2004, the Environmental Working Group (EWG) analyzed 117 hair dyes. It found:
- 62 per cent of products contained ingredients that are known or probable carcinogens, including dyes derived from coal tar
- One product contained lead acetate, a known reproductive toxin
- 79 per cent of products contained ingredients that contained impurities linked to breast cancer
- 96 per cent of products contained penetration enhancers that increase exposures to carcinogens and other ingredients of concern
- 73 per cent of products contained ingredients that are known allergens.
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