American Heritage® Dictionary of the English Language, Fourth 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.
- n. inorganic chemistry 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.
GNU Webster's 1913
- n. See under Prussian.
- adj. (Chem.) 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. any of various blue pigments
- n. a dark greenish-blue color
- The pigment was discovered in Germany (Prussia at the time) by Diesbach. (Wiktionary)
- 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)
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