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Colorant

CI 45100

CAS 3520-42-1
42

Safety score · 0–100

Moderate

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

CI 45100 (Acid Red 52) is a synthetic xanthene dye for pink/red shade. EU-permitted with restrictions, but it is not allowed near the eyes and can irritate at high doses.

Function

COLORANTHAIR DYEING

Skin benefits

  • Provides bright pink/red shade
  • Stable across pH range
  • Permitted EU cosmetic colorant in rinse-off uses

Known concerns

  • Restricted to non-eye-area in EU (Annex IV)
  • Possible irritation/photosensitivity at high %
  • Synthetic xanthene dye

References

EU

EU CosIng database

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

PC

PubChem

U.S. NIH compound data, GHS hazard codes and toxicity literature.

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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.