Prussian blue

Prussian blue

noun
1.
a moderate to deep greenish blue.
2.
one of the iron blues, a dark-blue, crystalline, water-insoluble pigment, Fe 4 [Fe(CN) 6 ] 3 , produced by reacting ferrocyanic acid or a ferrocyanide with a ferric compound: used in painting, fabric printing, and laundry bluing.

Origin:
1715–25; translation of French bleu de Prusse, so called because it was discovered and first reported in Berlin, capital of Prussia

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Collins
World English Dictionary
Prussian blue
 
n
1.  any of a number of blue pigments containing ferrocyanide or ferricyanide complexes
2.  a.  the blue or deep greenish-blue colour of this pigment
 b.  (as adjective): a Prussian-blue carpet

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

Prussian blue Prus·sian blue (prŭsh'ən)
n.
See Berlin blue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

prussian blue

any of several deep-blue pigments that are composed of complex iron cyanides and hence called iron blues. The most common of these pigments are Prussian, Chinese, Milori, and toning blue. Prussian blue has a reddish tint and is used almost exclusively in paints, enamels, and lacquers; Chinese blue is very dark, with a greenish tint, and is favoured for use in printing inks; Milori blue has a reddish tint; toning blue is dull, with a strong red tone. All these pigments are chemically similar, differences in shade arising from variations in particle size and details of the manufacturing process.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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