Substances & Homeopatic Remedies

Kali ferrocyanatum

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Kali ferrocyanatum


The word Kali is derived from the Arabic “kaly”, meaning ash and the word potassium comes from the term potash, or burned vegetable matter


Traditional name

Yellow prussiate of potash
Ferrocyanide of Potash
Potassium ferrocyanide
Kali Ferrocyanoretum
Kali Ferrocyanicum
Kali Ferrocyanate

Used parts



K3 Fe (CN)6 3H20



Original proving

Proved and introduced by James.B. Bell. MD

Description of the substance

Ferrocyanide of Potash is prepared by 'fusing animal substances such as the cuttings of horns, hoofs, and skins with Carbonate of Potash in an iron pot, liviating the crude product with water, and purifying the salt with crystallization" (Brunton).
Potassium ferrocyanide (K4Fe(CN)6·3H2O), also known as yellow prussiate of potash or potassium hexacyanoferrate(II), is a coordination compound forming lemon-yellow monoclinic crystals at room temperature and decomposing at its boiling point. It is insoluble in alcohol but a litre of water can dissolve just under three hundred grams of the crystals, and the solution can react with acid to release hydrogen cyanide gas. The resulting hydrogen cyanide (HCN) boils at 26 °C and, being slightly lighter than air, quickly evaporates clear of the release point.

Potassium ferrocyanide is also one of two compounds present in ferroxyl indicator solution (along with phenolphthalein) which turns blue in the presence of Fe2+ ions, and which can therefore be used to detect rust. It is possible to calculate the number of moles of Fe2+ ions by using a colorimeter.

On February 20, 2002 four Moroccans were arrested while in possession of detailed maps of the United States embassy in Rome, the Rome water supply network, and four kilograms of potassium ferrocyanide.