Colorant
ACID BLUE 9 ALUMINUM LAKE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
The aluminium lake of CI 42090 (Brilliant Blue FCF / Acid Blue 9). Permitted as an EU non-oxidative hair colorant with concentration and purity restrictions; not allowed in eye-area cosmetics.
Function
Skin benefits
- EU-listed cosmetic colorant
- Vivid blue shade with good light stability
- Aluminium lake limits migration into skin
Known concerns
- Restricted to non-oxidative hair dye in EU (Annex IV CI 42090)
- Triphenylmethane dye class has historic sensitisation reports
- Not approved for eye-area products in EU
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related colorants
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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.