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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 ...
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.
An example of a Chief's bead. The Chief's bead, named "ti-a, co-mo-shack" by North American Natives, are blue glass trade beads used during the late 18th century and early 19th century up and down the West coast of North America and the Columbia River Basin.
Minecraft: Story Mode, an episodic spin-off game developed by Telltale Games in collaboration with Mojang, was announced in December 2014. [8] [9] [10] Consisting of five episodes plus three additional downloadable episodes, the standalone game is a narrative and player choice-driven, and it was released on Windows, OS X, iOS, PlayStation 3, PlayStation 4, Xbox 360, and Xbox One via download ...
A glass building facade. Glass is an amorphous (non-crystalline) solid. Because it is often transparent and chemically inert, glass has found widespread practical, technological, and decorative use in window panes, tableware, and optics. Some common objects made of glass are named after the material, e.g. "glass", "glasses", "magnifying glass".
In medieval times, blue glass was made by adding cobalt blue, which at a concentration of 0.025% to 0.1% in soda-lime glass achieves the brilliant blue characteristic of Chartres Cathedral. The addition of sulphur to boron-rich borosilicate glasses imparts a blue colour. The addition of copper oxide at 2–3% produces a turquoise colour.
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