This entry shows data from the EU CosIng database. An editorial description has not been written and reviewed yet.
Functions
- Hair dyeing
- Imparting color to hair. Hair dyeing preparations may be temporary, semi-permanent, permanent, depending on the length of time the colorant remains on the hair.
EU regulation
EU · Annex IV, entry 511-(4-(Phenylazo)phenylazo)-2-naphthol
- Maximum concentration
- Not to be used in products applied on mucous membranes
- Conditions and warnings
- Purity criteria: anilin<=0.2% 2-naphthol <= 0.2% 4-aminoazobenzene <-0.1% 1-(phenylazo)-2-naphthol<=3% 1-[2-(phenylazo)phenylazo]-2-naphthalenol<=2%
- As of
- 3 November 2026 · (EC) 2009/1223
EU · Annex II, entry 13531-((4-Phenylazo)phenylazo)-2-naphthol (Solvent Red 23; CI 26100) when used as a substance in hair dye products
- As of
- 3 November 2026 · (EC) 2013/344