Hair dye products. Hair dye products contain many chemicals that lighten or darken hair colour. Some ingredients can cause allergic reactions. The che

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Hair dye products. Hair dye products contain many chemicals that lighten or darken hair colour. Some ingredients can cause allergic reactions. The chemical p-Phenylenediamine (PPD) is found in many hair dye products and can cause symptoms including asthma, dermatitis, throat and eye irritation. Long term use of hair dye may increase risk of certain cancers.

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