Relating to a chemical compound containing iron combined with hydrogen cyanide.
Compound of 'ferri-' (iron in +3 state) from Latin 'ferrum,' combined with 'hydrocyanic' (containing hydrogen and cyanide). This highly specialized term emerged in 19th-century chemistry as researchers studied iron-cyanide complexes.
Iron-cyanide compounds were actually some of the first synthetic pigments that gave artists brilliant, permanent blue colors—a far less sinister use than the name 'cyanide' might suggest! Prussian blue, one of history's most important colors, is essentially a ferrihydrocyanic compound.
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