Hair dye (nitro)
2-[bis(2-Hydroxyethyl)amino]-5-nitrophenol
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
Known as HC Yellow 4, this is a nitro-aromatic direct hair dye restricted under EU Cosmetics Regulation Annex III with strict concentration limits and warnings about sensitization and nitrosamine formation.
Skin benefits
- Provides yellow to orange shades in oxidative hair dye
- Direct dye that does not require oxidation
- Allows nuance shading in semi-permanent formulations
Known concerns
- Nitro-aromatic hair dye with potential skin sensitization
- EU Annex III restricted with maximum concentration limits
- Concerns over nitrosamine impurities in formulation
- Not suitable for eyelash or eyebrow tinting
- Patch testing recommended due to allergy risk
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, so always read the physical product label and consult a healthcare professional for personal concerns.