Current estimates suggest that 50-80% of women and 10% of men 40 years of age and over in the United States and Europe use permanent hair dye products. The aromatic amine p-phenylenediamine (PPD) is ...
A chemical compound used in many permanent hair dyes has been named Allergen of the Year for 2025 by the American Contact Dermatitis Society (ACDS). Toluene-2,5-diamine sulfate (PTDS) is an aromatic ...
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