Cobalt glass is a deep blue colored glass prepared by adding cobalt compounds to the molten glass. It is appreciated for its attractive color. It 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. Under fluorescent light, cobalt glass has twice the effect.
Some people collect objects made from cobalt glass, amassing large collections. One popular example of cobalt glass is Bristol blue glass, as in the distinctive blue bottles of Harvey's Bristol Cream sherry.
Read more about Cobalt Glass: For Pigment Use, History
Famous quotes containing the word glass:
“Each day I live in a glass room
Unless I break it with the thrusting
Of my senses and pass through
The splintered walls to the great landscape.”
—Mervyn Peake (1911–1968)