High Quality Content by WIKIPEDIA articles! Potassium ferrocyanide, also known as yellow prussiate of potash or potassium hexacyanidoferrate(II), is a coordination compound of formula K4[Fe(CN)6]•3H2O, which forms lemon-yellow monoclinic crystals at room temperature, and which decomposes at its boiling point. Although it is insoluble in alcohol, a liter of water can dissolve just under three hundred grams of the crystals, and the solution can react with acid to release toxic hydrogen cyanide (HCN) gas. The resulting HCN gas boils at 26 °C and, being lighter than air (with a gaseous density of 0.94), quickly evaporates clear of the release point.

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