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Prus'sian blue'

1. a moderate to deep greenish blue.
2. one of the iron blues, a dark-blue, crystalline, water-insoluble pigment, Fe4[Fe(CN)6]3, produced by reacting ferrocyanic acid or a ferrocyanide with a ferric compound: used in painting, fabric printing, and laundry bluing.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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