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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. Cobalt glass plates are used as an optical ...
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.
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 ...
New Martinsville Glass Company used an extensive list of colors in their glassware. A list of colors follows: Amber, Ruby, Evergreen, Amethyst, Cobalt Blue, Ritz Blue, Rose, Jade, Pale Blue, Light Green, Pink, Black, Yellow [5]
Blue Pale to deep blue. [20] Cobalt Blue A deep shade of blue and the most sought after. [20] Independence Blue 1975-76 A cobalt blue carnival treatment made during the U.S.Bicentennial. [21] Green This color ranges from a deep green to a light yellow green. [20] Marigold A yellow orange color. [20] Red A red color that is deep when held to a ...
Depending on the type and color of glass, other additives were used. Lead and tin were added for white opaque glass (latimo). Cobalt was used for blue glass. Copper and iron were used for green and for various shades of green, blue, and yellow. [70] Manganese was used to remove colors. [71]
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