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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.
It is uncertain when Bristol blue glass was first made but the quality and beauty of the glass swiftly gained popularity, with seventeen glass houses being set up in the city. [3] Lazarus and Isaac Jacobs were the most famous makers of Bristol blue glass in the 1780s. Lazarus Jacobs was a Jewish immigrant to Bristol from Frankfurt am Main, Germany.
Milk Glass with a blue edge. [25] Black Rose 1953-54 Peach Blow with a black edge. [25] Blue Ridge 1939 French Opalescent with a blue edge. [25] Crystal Crest 1942 Milk glass with a double row of crystal and white glass. [25] Emerald Crest 1949-55 Also called Green Crest in 1949. [25] Gold Crest 1943-45 Yellow glass on the edge of Milk glass ...
Details of the process and the composition of the glass vary and so do the results, because it is not a simple matter to obtain or produce properly controlled specimens. [5] 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 ...
Cobalt(II) oxide is an inorganic compound that has been described as an olive-green [3] or gray [4] solid.It is used extensively in the ceramics industry as an additive to create blue-colored glazes and enamels, as well as in the chemical industry for producing cobalt(II) salts.
Elegant glass manufacturers produced vibrant colors that varied far more than Depression Glass. [1] Shades of red, blue, green, amber, yellow, smoke, amethyst, and pink were produced. An easy way to compare the difference in color quality is to take a look at a piece of cobalt Elegant glass and place it alongside a piece of cobalt Depression Glass.
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