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Hair Dye

N-PHENYL-P-PHENYLENEDIAMINE

CAS 101-54-2
12

Safety score · 0–100

Avoid

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

A phenylenediamine hair-dye intermediate. It is a potent skin sensitizer with environmental hazards and is heavily restricted in EU cosmetic use.

Function

HAIR DYEING

Skin benefits

  • Used as an oxidative hair dye intermediate
  • Provides dark color development
  • Long industrial history

Known concerns

  • GHS H317: may cause an allergic skin reaction
  • Potent contact sensitizer
  • H361 suspected reproductive toxicant
  • H410 very toxic to aquatic life
  • EU restricts in cosmetic hair dyes

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.