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Hair Colorant

2,4-DIAMINOPHENOXYETHANOL HCL

CAS 66422-95-5 Updated
30

Safety score · 0–100

Caution

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

About

A SCCS-reviewed permanent hair-dye coupler. Restricted in the EU and a known sensitiser; should not be used on eyebrows or eyelashes.

Function

HAIR DYEING

Skin benefits

  • Permanent hair color coupler
  • Shade extender

Known concerns

  • Skin sensitisation (aromatic amine)
  • EU Annex III concentration cap
  • No eyebrow/eyelash use
  • Hair dye allergy risk

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.