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Hair Dye

4-AMINO-2-HYDROXYTOLUENE

CAS 2835-95-2
48

Safety score · 0–100

Moderate

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

An oxidative hair-dye coupler producing warm reds and browns. EU Annex III restricted to oxidative hair-dye products at max 1.5%, with SCCS noting moderate sensitisation potential. Not a skincare ingredient.

Skin benefits

  • Hair-dye coupler producing warm tones
  • Defined chemistry with controlled use in oxidative dyes
  • SCCS-reviewed with explicit safe-use caveats

Known concerns

  • EU Annex III caps it at 1.5% in oxidative hair dyes
  • Skin sensitiser — patch testing recommended
  • Not for use outside oxidative hair dye products

References

EU

EU CosIng database

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

PC

PubChem

U.S. NIH compound data, GHS hazard codes and toxicity literature.

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