Prussian-blue meaning

An insoluble dark blue pigment and dye, ferric ferrocyanide or one of its modifications.
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A moderate to strong blue or deep greenish blue.
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Any of a group of dark-blue powders, ferrocyanides of iron, used as dyes or pigments; esp., ferric ferrocyanide, Fe4[Fe(CN)6]3
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A strong, dark blue.
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(inorganic chemistry) An insoluble dark, bright blue pigment, ferric ferrocyanide (equivalent to ferrous ferricyanide), used in painting and dyeing, and as an antidote for certain kinds of heavy metal poisoning.
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A moderate to rich blue colour, tinted with deep greenish blue.

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Of a rich blue colour, tinted with green.
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Origin of prussian-blue

  • From its having been discovered by an 18th-century color-maker in Berlin (then in Prussia)

    From American Heritage Dictionary of the English Language, 5th Edition

  • The pigment was discovered circa 1700 in the German state of Prussia by a paint-maker named Diesbach.

    From Wiktionary