Other
Disodium 7-hydroxy-8-(phenylazo)naphthalene-1,3-disulphonate
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
An acid azo dye restricted in the EU for cosmetic use to products excluding mucous membranes, due to the theoretical risk of azo bond cleavage and aromatic amine formation.
This disodium naphthalene sulfonate azo dye is subject to EU CosIng restriction: 'Not to be used in products applied on mucous membranes.' The restriction reflects the conservative regulatory approach toward azo colorants, where reductive cleavage in certain physiological conditions could theoretically release aromatic amines. The restriction limits use to external skin applications and hair (non-scalp) products. Compliance with this restriction is essential for legal market placement in the EU under Regulation (EC) No 1223/2009.
Skin benefits
- Provides orange/red coloration in external cosmetic products
- Used in hair dyes and color cosmetics for external application
- Good solubility and color development
Known concerns
- EU restriction limits use to non-mucous membrane applications
- Azo bond reduction theoretical concern for amine release
- General dye sensitization potential
- Must not be used in lip, oral, or nasal products
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related others
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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.