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This ingredient is a common component in permanent hair dyes, acting as a color precursor. It reacts with other chemicals to create the desired hair color.
May aggravate
Safety summary
It is a known sensitizer and can cause allergic reactions, especially in individuals with sensitive skin or existing allergies to hair dyes. A patch test is always recommended before use.
CAS Number
150-75-4
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.