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The terms in bold link to topics in the AQA, Edexcel, OCR and WJEC A-level specifications, as well as the Highers/Advanced Highers exam specifications.
Hair bleaching involves redox chemistry to break down melanin (a polymer). Permanent hair dyeing uses organic chemistry, including nucleophilic attack and condensation reactions to introduce new, insoluble chromophores into the hair fibre.
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