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This ingredient, likely Toluene-2,5-diamine, is a primary intermediate used in permanent hair dyes. It reacts with other dye components to create the desired long-lasting hair color.
No specific concern data available
Safety summary
Toluene-2,5-diamine is a known sensitizer and a common cause of allergic contact dermatitis, especially in hair dye products. A patch test is highly recommended before use for individuals with sensitivities.
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.