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

Prussian-blue Sentence Examples

  • About the same time he showed by a wonderful series of experiments that the colouring matter of Prussian blue could not be produced without the presence Of a substance of the nature of an acid, to which the name of prussic acid was ultimately given; and he described the composition, properties and compounds of this body, and even ascertained its smell and taste, quite unaware of its poisonous character.

  • Potassium ferrocyanide, K 4 Fe(NC) 6, (yellow prussiate of potash), was first obtained by decomposing Prussian blue with caustic potash: Fe4[Fe(NC)6]3 + 12KHO = 3K 4 Fe(NC) 6 +4Fe(OH) 3; it may be also obtained by warming a solution of ferrous sulphate with an excess of potassium cyanide: FeS04-I-6KNC = K4Fe(NC)6+ K2S04.

  • It dissolves unchanged in concentrated sulphuric acid, and oxidizes readily in moist air, forming Prussian blue.

  • This is heated to boiling, and the residue after filtration contains about 30% of Prussian blue.

  • The metallic cyanides may be detected by adding ferrous sulphate, ferric chloride, and hydrochloric acid to their solution, when a precipitate of Prussian blue is produced; if the original solution contains free acid it must be neutralized by caustic potash before the reagents are added.

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