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Hair dye coupler

M-AMINOPHENOL HCL

CAS 51-81-0
45

Safety score · 0–100

Moderate

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

m-Aminophenol HCl is the hydrochloride salt of a permitted hair dye coupler producing warm tones. It is restricted in EU cosmetics by concentration and requires patch testing due to sensitization potential.

Skin benefits

  • Hydrochloride salt used as oxidative hair dye coupler
  • Produces warm brown to reddish shades
  • Permitted under EU Annex III with concentration limits

Known concerns

  • Documented skin sensitizer
  • Restricted maximum on-head concentration in EU
  • Cross-reactivity with related aminophenols
  • Patch testing recommended before use

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

Related hair dye couplers

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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.