Calcium ferrocyanide

Calcium ferrocyanide is an inorganic compound with the formula Ca2[Fe(CN)6].

It is the Ca2+ salt of [Fe(CN)6]4-, ferrocyanide complex ion.

A yellow solid, it is used as a precursor to the pigment Prussian blue.

[1] It was listed in 2012 by the EU as a "Food Improvement Agent".

In the EU, ferrocyanides (E 535–538) were, as of 2018, solely authorised in two food categories as salt substitutes.

NFPA 704 four-colored diamond Health (blue): no hazard code Flammability 0: Will not burn. E.g. water Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code