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smalt
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By that time also artificial blues had been discovered, smalt or cobalt blue which is cobalt aluminate in the 17th century, and then the famous Prussian blue, in 1704.
The blue colour of smalt derives from the addition of cobalt oxide to a potash glass melt during manufacture.
He took a sample about one-half-inch square that went right down to the bare wood for perusal in the laboratory and discovered that what we had was smalt .
One pertinent example was an advertisement in the New-York Gazette in 1748 for blue smalt , just in from London.
The rich green against the blue smalt should make Warner's bedchamber look even more dramatic.
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