The Collaborative International Dictionary
Ferricyanide \Fer`ri*cy"a*nide\ (?; 104), n. [Ferri- + cyanide.] (Chem.) One of a complex series of double cyanides of ferric iron and some other base.
Potassium ferricyanide (Chem.), red prussiate of potash; a dark, red, crystalline salt, K6(CN)12Fe2, consisting of the double cyanide of potassium and ferric iron. From it is derived the ferrous ferricyanate, Turnbull's blue.
Wikipedia
Potassium ferricyanide is the chemical compound with the formula K[Fe(CN)]. This bright red salt contains the octahedrally coordinated [[ferricyanide|[Fe(CN)]]] ion. It is soluble in water and its solution shows some green-yellow fluorescence.
Usage examples of "potassium ferricyanide".
Metcalfe took out a miniature vial of crystalline potassium ferricyanide, one of the items he usually carried on his person while in the field.