Issues in food allergy and intolerance, coeliac disease, gut disorders, eczema, 'free from' and all allergies and sensitivities
PPD, or paraphenylenediamine, is a chemical used in most permanent hair dyes, especially the darker types. When mixed with an oxidiser (typically hydrogen peroxide) and applied, it penetrates shafts of hair and transforms into an oxidised form whose molecules are…
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