FERRIC FERROCYANIDE
Colorant
Good
CAS Number: 12240-15-2/ 14038-43-8
About FERRIC FERROCYANIDE
Prussian blue pigment (CI 77510) — provides deep blue color in eyeshadows and mascaras. Despite the 'cyanide' in the name, the cyanide ions are tightly locked to iron and aren't released — it's safe.
Detailed Analysis
Ferric Ferrocyanide (Fe₄[Fe(CN)₆]₃, also CI 77510) is an inorganic pigment known as Prussian blue. The cyanide ligands are strongly bound to iron(II) centers in the hexacyanoferrate complex, making them essentially non-bioavailable. FDA-approved as a color additive; EU-permitted in all cosmetics provided it is free from unbound cyanide ions. Also used medically as an antidote for thallium and cesium-137 poisoning (FDA-approved drug). Provides intense, stable blue color with excellent lightfastness. Must be free from cyanide ions per regulatory requirements.
What It Does
Skin Benefits
- ✓ Provides vibrant, stable blue coloration
- ✓ Excellent lightfastness — color doesn't fade
- ✓ Non-toxic iron-based pigment
Known Concerns
- ⚠ Must be manufactured free from unbound cyanide ions
- ⚠ Avoid inhalation of dry powder during manufacturing
- ⚠ Some EWG concern ratings — but regulatory consensus supports safety
Safety Score
Good
Based on EU regulatory data, published safety research, and ingredient function analysis.
References
EU CosIng Database
European Commission cosmetic ingredient registry
PubChem
National Library of Medicine compound data
Check your products for FERRIC FERROCYANIDE
Scan any cosmetic product to see if it contains this ingredient and get a full safety breakdown.
Download LuxSenseThis information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional for skin concerns or allergies.