2-METHYL-1-NAPHTHOL is graded C (Moderate) by Expert·ING, based on COSING regulatory data. It is restricted under EU COSING — AnnexIII-SAFETY-.
2-METHYL-1-NAPHTHOL
Safety grade: C
This is a synthetic chemical compound derived from naphthalene, a substance originally found in coal tar. It is used as a component in hair coloring products to help create specific shades of color.
It is used in hair dye formulations as a color coupler, reacting with other dye components to produce or enhance specific hair color shades.
Graded using: COSING.
- EU COSING — Restricted
Last verified: May 26, 2026
Safer alternatives to 2-METHYL-1-NAPHTHOL
- 2-METHOXYMETHYL-P-PHENYLENEDIAMINE — Grade A. Direct substitute: oxidative hair dye intermediate that couples to form color shades
- 5-AMINO-6-CHLORO-O-CRESOL — Grade A. Oxidative hair dye coupler that reacts with oxidizing agents to develop hair color
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