E536 – Potassium ferrocyanide
StabiliserDescription
Potassium ferrocyanide (E536) is an inorganic coordination complex used primarily as an anticaking agent and crystal modifier in table salt and road salt. It functions by inhibiting the growth of sodium chloride crystals, preventing clumping. It is a stable, lemon-yellow crystalline powder, chemically distinct from highly toxic free cyanide salts.
Notes
Potassium ferrocyanide is a synthetic compound created by combining potassium, iron, carbon, and nitrogen in controlled laboratory conditions. Like its sodium cousin (E535), it contains cyanide and iron locked into a stable molecular complex, making it entirely different from dangerous free cyanide. The manufacturing process produces yellow crystals that are ground into a fine powder specifically for food industry use. This additive serves the same purpose as sodium ferrocyanide - it's an anticaking agent used almost exclusively in table salt to prevent clumping. It works by absorbing moisture that would otherwise cause salt crystals to stick together, ensuring your salt stays loose and pourable. You'll find it listed on ingredient labels of many commercial table salts, particularly those designed for use in humid climates where caking is more of a problem. Potassium ferrocyanide is completely synthetic and suitable for vegetarians and vegans. Despite the intimidating name, it's been thoroughly tested and approved by food safety agencies worldwide for use in salt at very low concentrations (typically under 20 parts per million). The cyanide component is chemically bound in a way that makes it stable and non-toxic under normal storage and cooking conditions. Some consumers prefer it over sodium ferrocyanide because it adds potassium rather than sodium to the diet, though the amounts are nutritionally insignificant.