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prussian blue

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Prussian blue

–noun
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.

Origin:
1715–25; trans. of F bleu de Prusse, so called because it was discovered and first reported in Berlin, capital of Prussia
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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iron blue  
n.  Any of various light-resistant and heat-resistant, semitransparent blue pigments of powerful tinctorial strength, used chiefly in permanent industrial finishes, printing inks, and artists' colors. Also called Prussian blue.
Prussian blue  
n.  
  1. An insoluble dark blue pigment and dye, ferric ferrocyanide or one of its modifications.

  2. See iron blue.

  3. A moderate to strong blue or deep greenish blue.


[From its having been discovered by an 18th-century color-maker in Berlin (then in Prussia).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: Prus·sian blue
Pronunciation: 'pr&sh-&n-'blü
Function: noun
1 : any of numerous blue iron pigments formerly regardedas the ferric salt of ferrocyanide
2 : a dark blue crystalline hydrated compound Fe4[Fe(CN)6]3·xH2O that is a ferrocyanideof iron and is used as a test for ferric iron called also ferric ferrocyanide
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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

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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