Colorant
ACID BLUE 9 AMMONIUM SALT
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
The ammonium salt of Acid Blue 9 (Brilliant Blue FCF), a triphenylmethane hair-dye colorant. Permitted in the EU only as a non-oxidative hair dye under Annex III concentration limits — use with awareness of sensitizer potential.
Function
Skin benefits
- Provides bright blue shade
- Permitted EU hair colorant under restriction
- Water-soluble for predictable formulation
Known concerns
- EU Annex III restricted with concentration limits
- Triphenylmethane dye — sensitization potential
- May stain skin temporarily
- Trace impurity concerns under tight purity specs
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related colorants
Same plant / compound family
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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.