出典:Wiktionary
出典:『Wiktionary』 (2026/02/18 20:14 UTC 版)
cobalt blue (countable and uncountable, plural cobalt blues)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/02 17:09 UTC 版)
Cobalt blue is a cool, slightly desaturated blue color, historically made using cobalt salts of alumina. It is used in certain ceramics (historically, especially Chinese porcelain) and painting; the different cobalt pigment smalt, based on silica, is more often used directly in tinted transparent glasses. The pigment is extraordinarily stable.