Skip to content

Colorant

2,3-Naphthalenediol, when used as a substance in hair dye products

CAS 92-44-4
30

Safety score · 0–100

Caution

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

A naphthalenediol hair-dye coupler restricted under EU Annex III. Recognised skin sensitizer; only allowed in oxidative hair colors at low capped concentration.

Skin benefits

  • Hair-dye coupler

Known concerns

  • EU Annex III restricted
  • Skin sensitizer
  • Aromatic dihydroxynaphthalene
  • Concentration cap

References

EU

EU CosIng database

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

Related colorants

30
2,3-Dihydro-1H-indole-5,6-diol and its hydrobromide salt (see note 17).
Colorant
 30
2-HEXYLOXYCARBONYL-P-PHENYLENEDIAMINE HCL
Colorant
 30
4-NITROGUAIACOL
Colorant
 30
ACID GREEN 1
Colorant
 30
ACID ORANGE 6
Colorant
 30
ACID RED 92
Colorant
 30
ACID VIOLET 9
Colorant
 30
BASIC BLUE 75
Colorant

Check your shelf

Find 2,3-Naphthalenediol, when used as a substance in hair dye products in your products.

Scan any cosmetic product with LuxSense to see if it contains 2,3-Naphthalenediol, when used as a substance in hair dye products and get a full ingredient breakdown with safety scores.

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.