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4-o-Tolylazo-o-toluidine

CAS 97-56-3
8

Safety score · 0–100

Avoid

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

4-o-Tolylazo-o-toluidine is a cosmetic ingredient used in product formulations. Its specific function may vary between products. Exercise caution due to limited available safety data.

4-o-Tolylazo-o-toluidine (also known as 2-methyl-4-(2-methylphenyl)diazenylaniline) is an azo compound derived from o-toluidine. Azo dyes in this structural class have been associated with carcinogenic metabolites (especially aromatic amines from azo reduction). While not explicitly listed in EU Annex II, the carcinogenic potential and structural alerts result in effective prohibition in cosmetic products, particularly for hair dye and lip cosmetic applications where skin absorption is significant.

Known concerns

  • Carcinogenic potential
  • Aromatic amine formation risk
  • Azo compound safety concerns
  • Not permitted in hair dyes and cosmetic colorants

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.