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Oxidative Hair Dye Precursor

1H-Pyrazole-4,5- diamine, 1-hexyl-, sulfate (2:1)

CAS 1361000-03-4
50

Safety score · 0–100

Moderate

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

An oxidative hair-dye intermediate used in permanent colour formulations. The EU SCCS assessed it as safe only up to 1.0% on-head, reflecting typical hair-dye sensitisation concerns.

Skin benefits

  • Oxidative hair-dye primary intermediate providing intense, varied shades
  • Good colour stability and intensity in finished dye formulations
  • Assessed positively by SCCS for use within strict concentration limits

Known concerns

  • Permanent hair dye precursor with known sensitisation potential
  • SCCS opinion restricts on-head concentration to a maximum of 1.0%
  • Patch testing strongly recommended before use
  • Not suitable for direct application to the skin

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.