Prussian blue

  1. any of a group of dark-blue powders, ferrocyanides of iron, used as dyes or pigments; esp., ferric ferrocyanide, Fe[Fe(CN)]
  2. a strong, dark blue

Origin: orig. discovered in Prussia (1704)

See Prussian blue in American Heritage Dictionary 4

noun
  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.

Origin:

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

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