smalt

/smawlt/US // smɔlt //UK // (smɔːlt) //

冶炼,盐,冶炼厂,炼钢

Definitions

n.名词 noun

1
- : a coloring agent made of blue glass produced by fusing silica, potassium carbonate, and cobalt oxide, used in powdered form to add color to vitreous materials.

The inferior kinds of smalt are occasionally adulterated with chalk.
This blue is distinguished from smalt by dissolving in acetic acid.
The calx of cobalt is of a deep blue colour, which, when fused, makes the blue glass called smalt.
The smalt is usually composed of one part of calcined cobalt, fused with two parts of powder of flint and one of pot-ash.
Sometimes a little indigo blue or smalt is also added, when a peculiar bloom colour is desired.