Hair Dye
2,3-DIAMINODIHYDROPYRAZOLO PYRAZOLONE DIMETHOSULFONATE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A modern pyrazolo-pyrazolone hair-dye developer. SCCS-reviewed and concentration-limited; lower sensitization than legacy PPD but still aromatic-amine class.
2,3-Diaminodihydropyrazolo pyrazolone dimethosulfonate (CAS 857035-95-1) is a next-generation pyrazolo-pyrazolone hair-dye developer designed to provide vivid shade range with lower sensitization than classical p-phenylenediamine (PPD). SCCS has evaluated this ingredient in the context of oxidative hair-dye dossiers and set maximum use concentrations. It still belongs to the aromatic-amine dye class and carries inherent concerns for potential sensitization and genotoxicity, though the pyrazolone architecture reduces these relative to PPD. Not classified CMR. Score sits in the Moderate/orange band — functional regulated hair-dye chemistry, held down from yellow by class-level concerns and thin long-term data.
Function
Skin benefits
- Vivid oxidative hair-dye color range
- Lower sensitization than classical PPD
- SCCS-evaluated with concentration limits
Known concerns
- Aromatic amine class — sensitization and genotoxicity concerns
- Concentration limits under SCCS
- Limited long-term use data
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related hair dyes
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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.