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Colorant

ACID BLUE 9

CAS 3844-45-9 Updated
55

Safety score · 0–100

Moderate

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

About

Brilliant Blue FCF, a widely used synthetic blue dye. Approved as a cosmetic colorant with low documented toxicity but some sensitiser potential.

Function

HAIR DYEING

Skin benefits

  • Vivid blue cosmetic colorant
  • Long approval history
  • Used at very low levels

Known concerns

  • Synthetic dye — possible sensitiser
  • Some restrictions in eye-area products
  • Sustainability 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 — always read the physical product label and consult a healthcare professional for personal concerns.