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During the late 18th century Richard Champion, a Bristol merchant and potter, making Bristol porcelain, was working with a chemist, William Cookworthy. [1] Cookworthy began a search for good quality cobalt oxide to give the blue glaze decoration on the white porcelain and obtained exclusive import rights to all the cobalt oxide from the Royal Saxon Cobalt Works in Saxony. [2]
Small concentrations of cobalt (0.025 to 0.1%) yield blue glass. The best results are achieved when using glass containing potash. Very small amounts can be used for decolorizing. 2 to 3% of copper oxide produces a turquoise color. Nickel, depending on the concentration, produces blue, or violet, or even black glass.
Cobalt glass—known as "smalt" when ground as a pigment—is a deep blue coloured glass prepared by including a cobalt compound, typically cobalt oxide or cobalt carbonate, in a glass melt. Cobalt is a very intense colouring agent and very little is required to show a noticeable amount of colour.
Delftware or Delft pottery, also known as Delft Blue [1] (Dutch: Delfts blauw) or as delf, [2] is a general term now used for Dutch tin-glazed earthenware, a form of faience. Most of it is blue and white pottery , and the city of Delft in the Netherlands was the major centre of production, but the term covers wares with other colours, and made ...
Blue glazes were first developed by ancient Mesopotamians to imitate lapis lazuli, which was a highly prized stone. Later, a cobalt blue glaze became popular in Islamic pottery during the Abbasid Caliphate, during which time the cobalt was mined near Kashan, Oman, and Northern Hejaz. [4] [5]
People looking to save money for a big trip or financial investment may want to make plans around an "extra" paycheck in their pocket.. Employees who get paid on a biweekly basis (every other week ...
A Florida man is accused of stabbing his estranged girlfriend up to 70 times during a fatal break-in - exactly one month after he was nabbed for assaulting the victim and ordered to stay away from ...
Cobalt blue is a commonly used color for interior decorating. [7] Automobiles. Several car manufacturers including Jeep and Bugatti have cobalt blue as paint options. Construction. Because of its chemical stability in the presence of alkali, cobalt blue is used as a pigment in blue concrete. Sports. Two Major League Soccer teams have cobalt ...
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