Cobalt glass

Smalt, historical dye collection of the Technical University of Dresden, Germany

Cobalt glass—known as "smalt" when ground as a pigment—is a deep blue colored glass prepared by including a cobalt compound, typically cobalt oxide or cobalt carbonate, in a glass melt. Cobalt is a very intense glass colorant and very little is required to show a noticeable amount of color. Cobalt blue glass is also used as an optical filter in flame tests to filter out the yellow flame caused by the contamination of sodium, and expand the ability to see violet and blue hues.

单词	Cobalt glass
释义	Cobalt glass 原声例句 VOA视频精选 They include bloodletting tools and cobalt glass bottles to store poisonous liquids. 包括采血工具和储存有毒液体的钴蓝色玻璃瓶。英语百科 Cobalt glass Cobalt glass—known as "smalt" when ground as a pigment—is a deep blue colored glass prepared by including a cobalt compound, typically cobalt oxide or cobalt carbonate, in a glass melt. Cobalt is a very intense glass colorant and very little is required to show a noticeable amount of color. Cobalt blue glass is also used as an optical filter in flame tests to filter out the yellow flame caused by the contamination of sodium, and expand the ability to see violet and blue hues.
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