Cobalt (in English: Cobalt) is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth’s crust only as chemical compounds, except for the few deposits found in natural metallic iron alloys. Pure cobalt, produced by regenerative smelting, is a hard, shiny, gray-silver metal.
Cobalt-based blue pigments (cobalt blue) have been used since ancient times for jewelry and paints, and to give glass a distinctive blue color، Later, however, the dye was thought to be known for metallic bismuth. Miners had long used the name Cobold Ore for some minerals producing blue pigments. This designation was because they contained few known metals, and when they melted toxic arsenic vapors were produced. In 1735, it was found that such an ore could be converted into a new metal (discovered for the first time since ancient times) and finally this ore was named Kobold.
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