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Colorant

Acid Orange 24 (CI 20170), when used as a substance in hair dye products

CAS 1320-07-6
22

Safety score · 0–100

Caution

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

A synthetic azo dye limited by EU law to hair dye use only. Documented sensitizer with concerns over potential aromatic amine release; should not appear in non-hair-dye products.

Skin benefits

  • Provides orange/brown shade in hair dye

Known concerns

  • Azo dye — potential aromatic amine release
  • Documented strong skin sensitizer
  • EU restricted to hair dye use only
  • Not permitted in other cosmetic categories

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.