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Colorant

HYDROXYPROPYL-P-PHENYLENEDIAMINE

CAS 73793-79-0
18

Safety score · 0–100

Avoid

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

A para-phenylenediamine class hair-dye intermediate. Strong skin and eye sensitiser carrying multiple GHS hazards; only used in rinse-off oxidation hair dyes with strict EU limits.

Function

HAIR DYEING

Skin benefits

  • Hair dye coupler
  • Permanent color performance
  • Targeted hair use

Known concerns

  • Strong skin sensitiser (PPD class)
  • Causes serious eye damage (H318)
  • Skin irritation (H315) and acute toxicity (H302/H312/H332)
  • SCCS reviews PPD-class amines for sensitisation

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.