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1-[(4-Methyl-2-nitrophenyl)azo]-2-naphthol

CAS 2425-85-6
38

Safety score · 0–100

Caution

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

About

1-[(4-methyl-2-nitrophenyl)azo]-2-naphthol is a cosmetic ingredient used in product formulations. Exercise caution due to limited available safety data.

Also identified as C.I. Pigment Red 3 or C.I. 12140, this monoazo compound is used as a colorant in rinse-off cosmetic products such as soaps, shampoos, and bath preparations. The EU CosIng database restricts its use to rinse-off products only (max concentration 0.5% as recorded), and the H318 (serious eye damage), H410 (aquatic toxicity), and H413 (may cause long-lasting effects) hazard statements confirm it must not be used in leave-on or eye-area cosmetics.

Skin benefits

  • Provides red-orange colorant function in rinse-off products

Known concerns

  • Serious eye damage (H318)
  • Aquatic toxicity (H410)
  • EU restricted to rinse-off products only at ≤0.5%
  • Not permitted in leave-on or eye cosmetics

References

EU

EU CosIng database

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

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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.