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Colorant

BROMOTHYMOL BLUE

CAS 76-59-5 Updated
50

Safety score · 0–100

Moderate

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

About

A pH-indicator dye that shifts from yellow to blue as pH rises, used in novelty colour-change cosmetics. Limited cosmetic safety data, so usage is generally conservative.

Skin benefits

  • Yellow-to-blue color indicator at neutral pH
  • Used at trace levels for novelty colour-change products

Known concerns

  • Brominated dye; primarily a laboratory pH indicator
  • Limited cosmetic safety data outside niche use
  • Possible mild eye and skin irritation at higher levels

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.