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Hair Dye

1,3-BIS-(2,4-DIAMINOPHENOXY) PROPANE HCL

CAS 74918-21-1
48

Safety score · 0–100

Moderate

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

A polyaminophenoxy hair dye precursor (HCl salt) used in permanent oxidative color systems. SCCS-evaluated and EU Annex III-restricted with maximum on-head use levels; sensitization is the main caveat.

Function

HAIR DYEING

Skin benefits

  • Effective dye precursor for permanent hair color
  • SCCS-evaluated with maximum on-head use levels
  • Reduces need for higher-allergenic alternatives in some shade systems

Known concerns

  • Polyaminophenoxy structure with sensitization potential
  • Annex III concentration limits required
  • Patch-test recommended for first-time users

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.