Hair Dye Intermediate
1,7-Naphthalenediol, when used as a substance in hair dye products
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
1,7-Naphthalenediol — a dihydroxynaphthalene used as a coupler in oxidative hair dyes. EU restricts the maximum on-head concentration and requires sensitization warnings; care needed in formulation and use.
Skin benefits
- Hair dye coupler
Known concerns
- EU Annex III restricted in hair dyes
- Skin and eye irritation hazards
- Skin sensitization potential
- Aquatic toxicity
- No use outside regulated hair-dye context
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.