Hair Colorant
2,3-Diamino-6,7- dihydro-1H,5H- pyrazolo[1,2-a] Pyrazol-1-one dimethanesulfonate
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
An oxidative hair-dye intermediate (a pyrazolone coupler). Like most permanent-dye chemistry, carries real sensitization risk and is tightly use-limited by EU SCCS — fine occasionally, problematic for frequent dyers.
Skin benefits
- Color development in oxidative hair dyes
Known concerns
- Hair dye intermediate with sensitization potential
- Aromatic amine class historically associated with allergic contact dermatitis
- Limited long-term safety data
- SCCS-regulated use concentration
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related hair colorants
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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.