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cobalt blue

noun

  1. a deep blue to a strong greenish-blue color.
  2. any of a number of pigments containing an oxide of cobalt.

cobalt blue

noun

  1. Also calledThénard'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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Word History and Origins

Origin of cobalt blue1

First recorded in 1825–35
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