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Related to Turnbull's blue: Ferric ferrocyanide
Turnbull's blue[′tərn‚bu̇lz ′blü]
A blue pigment that precipitates from the reaction of potassium ferricyanide with a ferrous salt.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.