Calcium ferrocyanide

Calcium ferrocyanide
Calcium ferrocyanide.svg
Other names
Dicalcium hexakis(cyano-κC)ferrate(4-)
3D model (JSmol)
ECHA InfoCard 100.034.085
EC Number
  • 237-508-9
E number E538 (acidity regulators, ...)
Molar mass 292.109 g·mol−1
GHS pictograms GHS07: Harmful
GHS signal word Warning
H302, H312, H315, H319, H332, H335
P261, P280, P301+312, P302+352, P304+340, P305+351+338, P332+313
NFPA 704
Flammability code 0: Will not burn. E.g. waterHealth (blue): no hazard codeReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Calcium ferrocyanide is a salt substitute, and was listed in 2012 by the EU as a "Food Improvement Agent". It is found at STP in the form of yellow crystals or crystalline powder.[1]


In the EU, ferrocyanides (E 535–538) were, as of 2018, solely authorised in two food categories as salt substitutes. Kidneys are the organ for ferrocyanide toxicity.[2]


  1. ^ "Compound Summary for CID 166920 - Calcium Ferrocyanide". PubChem.
  2. ^ Peter Aggett, Fernando Aguilar, Riccardo Crebelli, Birgit Dusemund, Metka Filipič, Maria Jose Frutos, Pierre Galtier, David Gott, Ursula Gundert‐Remy, Gunter Georg Kuhnle, Claude Lambré, Jean‐Charles Leblanc, Inger Therese Lillegaard, Peter Moldeus, Alicja Mortensen, Agneta Oskarsson, Ivan Stankovic, Ine Waalkens‐Berendsen, Rudolf Antonius Woutersen, Matthew Wright and Maged Younes. (2018). "Re‐evaluation of sodium ferrocyanide (E 535), potassium ferrocyanide (E 536) and calcium ferrocyanide (E 538) as food additives". EFSA Journal. 16 (7): 5374. doi:10.2903/j.efsa.2018.5374.CS1 maint: multiple names: authors list (link)