2,2'-[(4-Amino-3-nitrophenyl)imino]bisethanol hydrochloride and its salts
Other
Caution
CAS Number: 29705-39-3 - 94158-13-1
About 2,2'-[(4-Amino-3-nitrophenyl)imino]bisethanol hydrochloride and its salts
A nitro-substituted phenylenediamine hair dye intermediate with sensitisation concerns, permitted at up to 2.5% (as hydrochloride) but requiring oxidative conditions for safe use.
Detailed Analysis
This compound is a nitro-substituted m-phenylenediamine derivative used as a hair dye intermediate in oxidative colouring systems. The nitro group on the aromatic ring (para to the imino-bisethanol substituent) contributes to high tinctorial power but also raises sensitisation and potential genotoxicity concern, as nitro groups on aromatic amines can undergo metabolic reduction to reactive nitrenium ions. A maximum concentration of 2.5% (expressed as the hydrochloride salt) applies under EU Annex III, with use restricted to oxidative hair dye applications only.
Known Concerns
- ⚠ Skin sensitisation potential
- ⚠ Potential genotoxicity from metabolic activation of nitro group
- ⚠ Aryl amine metabolite concern
Safety Score
Caution
Based on EU regulatory data, published safety research, and ingredient function analysis.
References
EU CosIng Database
European Commission cosmetic ingredient registry
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