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4-METHYLBENZYL 4,5-DIAMINO PYRAZOLE SULFATE

CAS 173994-77-9
48

Safety score · 0–100

Moderate

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

About

A pyrazole-based hair dye intermediate used in oxidative hair coloring products. Diamino pyrazoles are effective couplers but carry sensitization risks that require regulatory monitoring.

This compound is a substituted pyrazole diamine that functions as a coupling agent in oxidative hair dye systems. The EU Cosmetics Regulation (EC No 1223/2009) does not list it in the prohibited (Annex II) or restricted (Annex III) substances, but structurally related diamino heterocycles are known skin sensitizers. It requires caution and proper labeling.

Skin benefits

  • Effective coupler in oxidative hair dye formulations
  • Produces stable color results when combined with oxidation bases

Known concerns

  • Potential skin sensitizer (delayed hypersensitivity)
  • Limited safety data in long-term topical use
  • May require specific purity controls as hair dye intermediate

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.