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Hair Dye Intermediate

2,3-NAPHTHALENEDIOL

CAS 92-44-4
22

Safety score · 0–100

Caution

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

2,3-Dihydroxynaphthalene – a hair-dye coupler. The naphthalenediol family is restricted in EU cosmetic hair-dye regulations and has documented sensitisation/mutagenicity flags.

Function

HAIR DYEING

Skin benefits

  • Used historically as a hair-dye intermediate

Known concerns

  • Naphthalenediol class is suspect mutagen/sensitiser
  • Hair-dye intermediates require strict EU restrictions
  • Skin sensitiser potential
  • Possible skin and eye irritant
  • Read-across to other dihydroxynaphthalenes – cytotoxic in vitro

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

Related hair dye intermediates

52
4-Hydroxyindole, when used as a substance in hair dye products
Hair Dye Intermediate
 55
1,7-Naphthalenediol, when used as a substance in hair dye products
Hair Dye Intermediate

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.