ferrocyanide
Noun
Meaning
One of a series of complex double cyanides of ferrous iron and some other base.
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Applications Potassium ferrocyanide finds many niche applications in industry.
Its formation can be used as a simple wet chemistry test to distinguish between aqueous solutions of Fe 2+ and Fe 3+ as they react (respectively) with potassium ferricyanide and potassium ferrocyanide to form Prussian blue.
It is possible to reduce ferricyanide ions to ferrocyanide ions at the cathode: :Fe(CN)main + e − → Fe(CN)main Neutral molecules can also react at either of the electrodes.
Niche uses Potassium ferrocyanide is used to achieve a blue color on cast bronze sculptures during the final finishing stage of the sculpture.
The signal current moved an iron pen across a moving paper tape soaked in a mixture of ammonium nitrate and potassium ferrocyanide, decomposing the chemical and producing readable blue marks in Morse code.
Toxicity Potassium ferrocyanide is nontoxic, and is not decomposed to cyanide in the body.