Black then brown and as cools down grey. :)
The color of the cobalt streak is blue
Cobalt !
The pigments in cobalt salts of alumina are used to make the color cobalt blue. The pigments are strong, which is why the color is used in many pieces of jewelry, paint and ceramics.
mostly blue.
Cobalt is a silvery gray metal. A link is provided.
Actual cobalt is silver, but in artist colors it is usually a shade of blue.
A cobalt sulfate solution is typically blue in color.
A cobalt chloride paper will turn pink when exposed to water vapor. This color change is due to the cobalt chloride reacting with the water vapor to form pink cobalt chloride hexahydrate.
When burned, fluorine gas is a pale yellow color.
The PMS color for cobalt blue is PMS 286. It is a deep, rich blue color often used in printing and design projects.
Cobalt.
Magnesium turns a bright white color when burned.