P-AMINOPHENOL

Para-aminophenol (PAP) is an ingredient in permanent hair dye formulations that acts as an oxidative dye precursor, forming colored compounds when mixed with other ingredients and an oxidative agent like hydrogen peroxide. It creates colors in the hair by chemically bonding with the hair’s natural melanin. While used at restricted, safe concentrations in cosmetics, it is known to be a skin and scalp sensitizer (allergen) and an irritant, so precautions are necessary, particularly for those with a history of allergies or skin issues.