BROMPHENOL BLUE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A synthetic dye that gives cosmetic products their colour — strictly regulated, with potential irritation concerns for sensitive skin.
Bromophenol Blue (C.I. Acid Blue 104) is a synthetic sulfonphthalein dye used historically as a pH indicator and in some cosmetic colourant applications. It is not a typical ingredient in modern leave-on skincare products and is more commonly associated with diagnostic and laboratory uses. As a synthetic dye, it carries a higher potential for skin and eye irritation compared to most other cosmetic ingredients. Its use in cosmetics is limited and heavily regulated — it is not listed in the EU CosIng inventory for broad cosmetic use. Some sulfonphthalein dyes have been associated with hypersensitivity reactions.
Known concerns
- Potential skin and eye irritant
- Not widely approved for leave-on cosmetic use
- May cause hypersensitivity reactions in sensitive individuals
- Limited safety data in cosmetic context
References
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.