Ferric Ferrocyanide
AKA “iron(III) hexacyanoferrate(II), Prussian blue insoluble, Ferrocin, Berlin Blue, Preussischblau, Ferric hexacyanoferrate, Berliner Blau, Turnbulls Blau, CHEBI:30069”
Mineral
Ingredient Facts
Ferric ferrocyanide
AKA: Iron(III) hexacyanoferrate(II), Prussian blue insoluble, Ferrocin, Berlin Blue, Preussischblau, Ferric hexacyanoferrate, Berliner Blau, Turnbulls Blau, CHEBI:30069
Mineral · Cosmetic Colorant · EWG: 4
Synthetic
Colorant
Mineral
Not Clean
Prussian blue is described as a deep blue pigment that is produced when the oxidation of ferrous ferrocyanide salts occurs. It contains ferric hexacyanoferrate(II) in a cubic lattice crystal structure. It is insoluble in water but also tends to form a colloid thus can exist in either colloidal or water-soluble form, and an insoluble form. It is orally administered for clinical purposes to be used as an antidote for certain kinds of heavy metal poisoning, such as thallium and radioactive isotopes of caesium. Prussian blue is included in the World Health Organization Model List of Essential Medicines as a specific antidote used in poisonings to provide symptomatic and supportive treatment. It was also administered in individuals exposed to 137-Cs+ during Goiânia accident, one of the worst radioactive contamination incidents that occured in Brazil, 1983.
Solubility Mostly insoluble in hot or cold water. 6 mg/mL at 25 deg C
Formula
C18Fe7N18
Mol. Weight
859.20
State
Purple solid; Mostly soluble in water (6 g/L); [Merck Index] Deep blue powder; [MSDSonline]
See origin →
Functions
Cosmetic Colorant
Gives the product its color. Purely aesthetic — makes the formula look good in the jar but does nothing for your skin.
Provides scent
Skin Types
●all-skin-types
Best For
General
Verified Jun 2026
Data: PubChem · CosIng · EWG