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Hair Dye

HC YELLOW NO. 4

CAS 59820-43-8
52

Safety score · 0–100

Moderate

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

A nitroaromatic sulfonic acid direct dye producing yellow tones in hair color. SCCS-reviewed and EU Annex III-restricted; genotoxicity signals at high concentrations led to lower allowed use levels.

Function

HAIR DYEING

Skin benefits

  • Provides yellow tones in semi-permanent oxidative hair color
  • SCCS-evaluated and listed in EU Annex III
  • Sulfonate group reduces systemic absorption relative to unsulfonated analogs

Known concerns

  • Nitroaromatic structure — sensitization class concern
  • Restricted concentration in finished products
  • Suspected genotoxicity flagged in SCCS review for high concentrations

References

EU

EU CosIng database

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

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Same plant / compound family

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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.