99.7% Purity Sodium ferrocyanide Anti-caking Agent Light Yellow Crystals for Food and Industrial Use

• Appearance: Lemon-yellow to off-white crystals or powder.
• Solubility: Highly soluble in water, but insoluble in most organic solvents (like alcohol).
• Stability: It is stable in air but can decompose at very high temperatures (above 400°C or 752°F) into sodium cyanide, iron carbide, and nitrogen—but this requires extreme, non-food-grade conditions.
• Taste: Slightly saline, astringent.

1. Anticaking Agent in Food (E535)
This is its most well-known application. Sodium ferrocyanide is added to table salt to prevent clumping, allowing it to flow freely. It is approved as a food additive (E535) in the EU, USA (under 21 CFR 42240 as "sodium ferrocyanide decahydrate"), and many other countries, typically at concentrations below 13–36 ppm (parts per million). It is also used in wine, citric acid, and cream to prevent crystallization or remove trace metals.

2. Industrial & Chemical Uses

• Blue Pigment Production: It is a key precursor for making Prussian Blue (ferric ferrocyanide), a famous dark blue pigment used in paints, inks, and anti-corrosion coatings.
• Metal Treatment: Used in rust removers, metal surface hardening, and as an additive in steel manufacturing to improve hardness.
• Electroplating: Acts as a complexing agent in copper and silver plating baths.
• Wine Making: Used to remove copper and iron ions that cause cloudiness or off-flavors (a process called "blue fining").
• Anti-caking agent Primarily used as an anti-caking agent for table salt, it prevents fine powder and crystalline foods from absorbing moisture and caking, thereby extending the shelf life

Is it dangerous?
No. The "cyanide" in sodium ferrocyanide is not bioavailable. The human stomach (with its acidic HCl) does not have the conditions necessary to break the iron-cyanide bond. In fact, the LD50 (lethal dose) of sodium ferrocyanide is around 5000 mg/kg (similar to table salt), whereas potassium cyanide has an LD50 of ~5 mg/kg (1000x more toxic).

The "Cyanide in Salt" Myth:
A persistent internet myth claims that adding vinegar (acid) to table salt releases deadly hydrogen cyanide gas. This is false. While strong, concentrated acids can theoretically liberate HCN from ferrocyanide, the dilute acetic acid in vinegar (4-8%) at room temperature cannot break the stable complex. Even if it could, the tiny amount present (ppm levels) would produce a negligible, non-harmful quantity.