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cobalt blue

a deep blue to a strong greenish-blue color.
any of a number of pigments containing an oxide of cobalt.
Also called king's blue, Thenard's blue.
Origin of cobalt blue
First recorded in 1825-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for cobalt blue
Historical Examples
  • Let us suppose that we make a tint by adding white to cobalt blue.

    Principles of Decorative Design

    Christopher Dresser
  • A bag was filled with the crustaceæ, whose shells were of a cobalt blue.

    Abandoned Jules Verne
  • The first practical use of cobalt was in the form of zaffre or cobalt blue.

    De Re Metallica Georgius Agricola
  • A bag was filled with the crustaceae, whose shells were of a cobalt blue.

    The Mysterious Island Jules Verne
  • It is only when he is seen with the sun shining upon him that the cobalt blue patches in his plumage are noticed.

  • This pigment was cobalt blue (see note on p. 112), indicating a considerable confusion of these minerals.

    De Re Metallica Georgius Agricola
  • It is also used to form a resist-paste in calico printing, and in the manufacture of cobalt blue.

  • There shone the lake—a brilliant patch of cobalt blue, bordered by outlines of vivid green pasture and belts of timber.

    Station Amusements Lady Barker
  • The distinguishing feature of the decoration is the combination of violet from manganese with cobalt blue.

    The Ceramic Art Jennie J. Young
  • Very good results in soap may be obtained by mixing a fast blue, as ultramarine or cobalt blue, with a red as rhodamine or eosine.

    Soap-Making Manual E. G. Thomssen
British Dictionary definitions for cobalt blue

cobalt blue

Also called Thénard's blue. any greenish-blue pigment containing cobalt aluminate, usually made by heating cobaltous sulphate, aluminium oxide, and phosphoric acid together
  1. a deep blue to greenish-blue colour
  2. (as adjective): a cobalt-blue car
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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