2,7-NAPHTHALENEDIOL is graded C (Moderate) by Expert·ING, based on COSING regulatory data. It is restricted under EU COSING — AnnexIII-SAFETY-.
2,7-NAPHTHALENEDIOL
Safety grade: C
This is a chemical compound derived from naphthalene that contains two hydroxyl groups, giving it the ability to react with other dye components. It is used as a coupler in oxidative hair coloring products to help create a range of hair color shades.
This ingredient is used in permanent hair dyes as a color coupler, reacting with oxidative dye intermediates to develop and fix specific hair color tones.
Graded using: COSING.
- EU COSING — Restricted
Last verified: May 26, 2026
Safer alternatives to 2,7-NAPHTHALENEDIOL
- 2-METHOXYMETHYL-P-PHENYLENEDIAMINE — Grade A. Direct hair dye intermediate; develops color through oxidative coupling like couplers
- LAWSONIA INERMIS EXTRACT — Grade A. Plant-based hair dye alternative; provides natural color tones in hair formulations
Other Hair Dyeing ingredients
- RESORCINOL — Grade E**
- THYMOL — Grade A
- M-AMINOPHENOL — Grade C**
- P-AMINOPHENOL — Grade C**
- 2-METHYLRESORCINOL — Grade C
- 4-AMINO-2-HYDROXYTOLUENE — Grade C
- P-PHENYLENEDIAMINE — Grade D**
- 2-METHYL-5-HYDROXYETHYLAMINOPHENOL — Grade C