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HC RED NO. 9

CAS 56330-88-2
46

Safety score · 0–100

Moderate

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

About

Hc Red No. 9 is a cosmetic ingredient used in product formulations. Note: subject to regulatory restrictions in some markets. Exercise caution due to limited available safety data.

HC Red No. 9 (CI 11277, CAS 56330-88-2) is an azo-type hair dye intermediate. EU CosIng restriction II/1305 under Annex III sets specific conditions for permitted use. Under the EU Cosmetics Regulation, azo dyes used as hair dye precursors are subject to the oxidation hair dye restrictions (maximum concentration in the ready-to-apply mixture, and prohibition in eye products). The compound may release aromatic amines on reduction, raising mutagenicity concerns if improperly used. Contact dermatitis and sensitisation are documented adverse reactions. The safety score reflects the conditional permitted status with appropriate restrictions, versus a fully unrestricted cosmetic ingredient.

Known concerns

  • EU Annex III restricted (II/1305) — conditional use only
  • Sensitisation and contact dermatitis risk
  • Potential azo cleavage yielding aromatic amines with mutagenic potential
  • Oxidation hair dye restrictions apply (no eye products)
  • Requires PPD coupling control in formulations

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.