Potassium hexacyanoferrate(II) K₄[Fe(CN)₆]·3H₂O

The chemical formula is K₄[Fe(CN)₆]·3H₂O, an inorganic compound usually found in the form of a trihydrate. Below is key information about it:

Basic Properties Appearance: Pale yellow crystals.

Solubility: Easily soluble in water, yielding a yellow aqueous solution; almost insoluble in ethanol, etc.

Stability: Stable at room temperature; may decompose at high temperatures (around 400°C or above), but extremely stable at normal cooking temperatures (<200°C).

Common Uses

1. Food Additive (Anticaking Agent)

   Used to prevent caking in table salt, powdered seasonings, etc., with very low usage levels.

   Safety: It is extremely difficult to decompose into harmful substances in food, and its reasonable use is harmless.

2. Industrial Applications  

   - Used as a metallurgical aid, in dye synthesis, and as a raw material for pigments (such as Prussian blue).

   - Used in laboratories as a reagent for detecting iron ions (producing a blue precipitate).

Precautions

Avoid contact with strong acids, as it may produce harmful substances.

Use protective equipment during industrial handling to prevent inhalation of dust.