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Hair Dye

4-AMINO-2-HYDROXYTOLUENE SULFATE

CAS 183293-62-1
45

Safety score · 0–100

Moderate

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

An aromatic amine intermediate used in permanent hair dyes to produce warm reddish-brown tones. SCCS-reviewed and EU Annex III-restricted; can sensitize and cause allergic contact dermatitis in susceptible users.

Function

HAIR DYEING

Skin benefits

  • Provides warm tones in oxidative hair color
  • Effective coupler/intermediate at low use levels
  • Regulated under EU Annex III with safe-use concentration limits

Known concerns

  • Documented skin sensitizer — can trigger allergic contact dermatitis
  • Cross-reactivity with PPD-allergic individuals
  • Aromatic amine class with general patch-test recommendation

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, so always read the physical product label and consult a healthcare professional for personal concerns.