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.
About
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.
Related hair dye intermediates
Check your shelf
Find 1,7-Naphthalenediol, when used as a substance in hair dye products in your products.
Scan any cosmetic product with LuxSense to see if it contains 1,7-Naphthalenediol, when used as a substance in hair dye products and get a full ingredient breakdown with safety scores.
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.