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cobalt blue in British English
noun
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
cobalt blue in American English
1.
a dark-blue pigment consisting of a mixture of cobalt and aluminum oxides
2.
dark blue
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