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Colorant

Sodium 4-(2,4-dihydroxyphenylazo)benzenesulphonate

CAS 547-57-9
42

Safety score · 0–100

Moderate

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

C.I. Acid Orange 6 — a synthetic azo dye colorant. EU restrictions apply because azo bonds can metabolise to aromatic amine sensitisers; suitable only within strict regulatory limits.

Skin benefits

  • Functional colorant role

Known concerns

  • Azo dye — potential aromatic amine release
  • Sensitisation risk
  • EU Annex IV restrictions
  • Mucosa contact concerns

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, so always read the physical product label and consult a healthcare professional for personal concerns.