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Related to Turnbull's blue: Ferric ferrocyanide
|1.||(Chem.) The double cyanide of ferrous and ferric iron, a dark blue amorphous substance having a coppery luster, used in dyeing, calico printing, etc. Cf. Prussian blue, under Prussian.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.