one of the main chemicals in most hair dyes has been banned in several European countries, and hair dye chemicals have been shown to have a variety of harmful effects in scientific experiments. Use of hair dye has been linked to allergic reactions, respiratory disorders and even cancer. the persulfates used in bleaches and PPD(P-Phenylenediamine) from hair dyes can both cause allergic reactions. THere is also proof of dyes causing cancer in lab animals.
A known carcinogen — called 4-ABP, has been found in many hair dyes off the shelf.
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