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Trisodium 5-hydroxy-1-(4-sulphophenyl)-4-(4-sulphophenylazo)pyrazole-3-carboxylate (CI 19140)
May aggravate
Safety summary
Generally safe for hair dyeing applications. Allergic reactions are rare but possible, especially for those with dye sensitivities.
Maximum concentration
Typically used at up to 0.5% in cosmetic formulations.
CAS Number
1934-21-0
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.