Restricted hair dye intermediate
1,5-Naphthylenediamine
Safety score · 0–100
Avoid
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
An aromatic diamine of the type historically used in hair dyes. The class is associated with strong skin sensitisation and CMR concerns and is not on the EU list of approved hair dye intermediates.
Skin benefits
- Historically used as a hair dye coupler/intermediate
- No meaningful consumer benefit outside the dyeing function
Known concerns
- Aromatic diamine class includes known carcinogens, mutagens or skin sensitisers
- Naphthylenediamines are strong skin sensitisers and can cause severe allergic dermatitis
- Subject to EU CMR-based restrictions on hair dye intermediates
- Not on the EU positive list of permitted hair dye substances under Annex III
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related restricted hair dye intermediates
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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.