2,3-Naphthalenediol, when used as a substance in hair dye products
Other
Caution
CAS Number: 92-44-4
About 2,3-Naphthalenediol, when used as a substance in hair dye products
A naphthalenediol hair dye coupler — irritating to skin, eyes, and respiratory tract. Can cause serious eye damage.
Detailed Analysis
2,3-Naphthalenediol is a dihydroxynaphthalene used as an oxidative hair dye coupler. GHS classifications include H302 (harmful if swallowed, 16%), H315 (skin irritation, 96%), H318/H319 (serious eye damage/irritation), and H335 (respiratory irritation, 94%). It is restricted when used in hair dye products. The high consensus rates for skin and respiratory irritation indicate reliable hazard data. Signal word is 'Danger'.
Known Concerns
- ⚠ Serious eye damage/irritation (H318/H319)
- ⚠ Skin irritant (H315)
- ⚠ Respiratory irritant (H335)
- ⚠ Harmful if swallowed (H302)
- ⚠ Restricted hair dye
Safety Score
Caution
Based on EU regulatory data, published safety research, and ingredient function analysis.
References
EU CosIng Database
European Commission cosmetic ingredient registry
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