Colorant
Ferric Ammonium Ferrocyanide
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
An iron-based blue pigment in the Prussian-blue family. Approved as a cosmetic colorant for external use. Cyanide is tightly bound and not bioavailable in the intact pigment.
Skin benefits
- Stable blue cosmetic pigment
- Approved colorant in many regions
- Insoluble pigment, low absorption
Known concerns
- Cyanide is bound and stable, but degradation could release trace cyanide
- Restricted to external use in many regions
- Not approved for lip or eye-area in some jurisdictions
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
PubChem
U.S. NIH compound data, GHS hazard codes and toxicity literature.
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.