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Colorant

SODIUM BROMOTHYMOL BLUE

CAS 34722-90-2 Updated
55

Safety score · 0–100

Moderate

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

About

The sodium salt of bromothymol blue, used as a colour-changing indicator dye. PubChem flags ingestion harm plus skin and eye irritation; cosmetic use is niche and limited.

Function

HAIR DYEING

Skin benefits

  • Provides pH-indicator colour
  • Used in novelty cosmetics
  • Bright blue-green shade

Known concerns

  • GHS H302/H315/H319 (PubChem)
  • Bromine-containing dye
  • Limited cosmetic dossier

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.