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Hair Dye

1,5-NAPHTHALENEDIOL

CAS 83-56-7 Updated
20

Safety score · 0–100

Caution

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

About

A naphthalene diol used as a coupler in oxidative hair dyes. PubChem GHS flags it as a skin sensitizer, harmful if swallowed, and eye irritant. EU restricts its use to hair dye products.

Function

HAIR DYEING

Skin benefits

  • Hair color development as oxidative coupler

Known concerns

  • Skin sensitization risk
  • Acute oral toxicity
  • Eye irritation
  • Aquatic toxicity

References

EU

EU CosIng database

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

Related hair dyes

20
3,4-METHYLENEDIOXYANILINE
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p- Phenylene-diamine and its salts
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P-PHENYLENEDIAMINE GLYCIDYL ETHER
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 18
P-PHENYLENEDIAMINE HYDROXYETHYL ETHER
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 15
2-Amino-5-nitrophenol
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 15
BASIC BLUE 99
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 28
HYDROXYPROPYL-P-PHENYLENEDIAMINE HCL
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 12
N-PHENYL-P-PHENYLENEDIAMINE
Hair Dye

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