Refers to the deep blue color of cobalt pigments. Often used in artistic, design, or descriptive contexts. Synonymous with コバルトブルー.
See also: コバルトブルー
She wore a cobalt blue dress.
This paint is close to cobalt blue.
Compound of コバルト (cobalt) and 色 (color). The color name derives from the use of cobalt compounds to produce deep blue pigments.