Prussian blue

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Prussian blue,

pigmentpigment,
substance that imparts color to other materials. In paint, the pigment is a powdered substance which, when mixed in the liquid vehicle, imparts color to a painted surface.
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 widely used for laundry bluing, in dyeing compounds, and in the manufacture of inks and paints. Several varieties are known, one of which consists of the chemical compound ferric ferrocyanide.
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Prussian blue

[′prəsh·ən ′blü]
(inorganic chemistry)
Fe4[Fe(CN)6]3 Ferric ferrocyanide, used as a blue pigment and in the removal of hydrogen sulfide from gases.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

prussian blue

1. A class of deep blue pigments of ferric-ferrocyanides; tends to fade in light tints; reactive with alkalies; ferrocyanide blue.
2. Any color produced with Prussian blue, e.g., Chinese blue.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.