1-HYDROXYETHYL 4,5-DIAMINO PYRAZOLE SULFATE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
An oxidative hair dye intermediate used in permanent hair coloration, typically requiring coupling with a developer.
This pyrazole derivative is used as a primary intermediate in oxidative (permanent) hair dye formulations. Many hair dye intermediates are subject to restriction in EU Annex III, and this specific compound requires safety assessment under Regulation 1223/2009. The sulfated form improves water solubility for formulation purposes. Like most oxidative hair dye precursors, it must be used with an oxidising agent and is not permitted in non-oxidative formulations.
Skin benefits
- Enables permanent hair coloration
- Used in professional and consumer hair dye products
Known concerns
- Hair dye intermediate - requires safety assessment
- Potential sensitiser in unoxidised form
- EU Annex III listing possible for hair dye intermediates
References
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.