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.


Origin:
1825–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cobalt blue
 
n
1.  Also called: Thénard's blue any greenish-blue pigment containing cobalt aluminate, usually made by heating cobaltous sulphate, aluminium oxide, and phosphoric acid together
2.  a.  a deep blue to greenish-blue colour
 b.  (as adjective): a cobalt-blue car

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Shades of a cobalt blue fresco can be found above the stepped altar.
The color is magnificent, with the cobalt blue sky in the background and the
  warm light on the lion.
The dark cobalt blue of the ocean was the only color the artists were unable to
  find in stone.
Harder to find colors include sea foam and olive green, aqua, cobalt blue and
  amber.
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