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Hair Dye

HYDROXYPROPYL-P-PHENYLENEDIAMINE HCL

Updated
28

Safety score · 0–100

Caution

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

About

A modified p-phenylenediamine used as a permanent hair-dye precursor. EU restricts use to oxidative dyes at low levels because PPD-class compounds are potent skin sensitizers.

Function

HAIR DYEING

Skin benefits

  • Oxidative hair-dye precursor
  • Provides intense color development
  • Modified PPD with reduced sensitization vs. parent

Known concerns

  • Strong skin sensitizer (allergic contact dermatitis)
  • Cross-reactive with PPD-allergic individuals
  • EU restricted: leave-on prohibited; rinse-off ≤2% as free base
  • Should not be used on persons under 16

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.