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Colorant

ACID YELLOW 73

CAS 2321-07-5 Updated
25

Safety score · 0–100

Caution

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

About

A fluoran-based synthetic colorant (CAS 2321-07-5, fluorescein/CI 45350) used as a hair dye and cosmetic colour. Heavily restricted in the EU due to its classification as a coal-tar hair dye.

Function

COLORANTHAIR DYEING

Skin benefits

  • Provides yellow/green fluorescent shade

Known concerns

  • EU Annex IV restrictions for cosmetic use
  • Coal-tar dye class concerns
  • Sensitisation case reports

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.