from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An insoluble dark blue pigment and dye, ferric ferrocyanide or one of its modifications.
  • n. See iron blue.
  • n. A moderate to strong blue or deep greenish blue.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An insoluble dark, bright blue pigment, ferric ferrocyanide (equivalent to ferrous ferricyanide)
  • n. A moderate to rich blue colour, tinted with deep greenish blue.
  • adj. Of a rich blue colour, tinted with green.

from the GNU version of the Collaborative International Dictionary of English

  • adj. any one of several complex double cyanides of ferrous and ferric iron; specifically, a dark blue amorphous substance having a coppery luster, obtained by adding a solution of potassium ferrocyanide (yellow prussiate of potash) to a ferric salt. It is used in dyeing, in ink, etc. Called also Williamson's blue, insoluble Prussian blue, Berlin blue, etc.
  • n. See under Prussian.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of various blue pigments
  • n. a dark greenish-blue color


From its having been discovered by an 18th-century color-maker in Berlin (then in Prussia).
(American Heritage® Dictionary of the English Language, Fourth Edition)
The pigment was discovered in Germany (Prussia at the time) by Diesbach. (Wiktionary)


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