The vast majority of reactions to hair-dye products are caused by PPD. [4–6] In past years, PPD was used in permanent hair dyes but not in semipermanent dyes. More recently, PPD has been used in most ...
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 ...
Wellness vlogger Chemese learned she was allergic to para-phenylenediamine (PPD) in 2014. Para-phenylenediamine, a chemical variant found in most hair dyes, has been the source of many allergic ...
The majority of permanent hair dyes used in the US and Europe contain the aromatic amine p-phenylenediamine (PPD). A growing body of evidence has linked this organic chemical to severe allergic ...
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