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Selenium, like manganese, can be used in small concentrations to decolorize glass, or in higher concentrations to impart a reddish color, caused by selenium nanoparticles dispersed in glass. It is a very important agent to make pink and red glass. When used together with cadmium sulfide, [9] it yields a brilliant red color known as "Selenium Ruby".
Came glasswork includes assembling pieces of cut and possibly painted glass using came sections. The joints where the came meet are soldered to bind the sections. When all of the glass pieces have been put within came and a border put around the entire work, pieces are cemented and supported as needed. [1]
The colored glass is crafted into stained glass windows in which small pieces of glass are arranged to form patterns or pictures, held together (traditionally) by strips of lead, called cames or calms, and supported by a rigid frame. Painted details and yellow stain are often used to enhance the design.
Detail of 12th-century stained glass window in Strasbourg Cathedral; black and white paint has been used on the coloured glass. Secondly it refers to stained glass, used for windows. Here the design is made up using sheets of coloured glass, cut to shape and held in place by lead. The painting is the final stage, typically only in black. [2]
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.
A second method is apparently to produce a black glass which, when held to the light, will show the true color that this glass will give to another glass when used as a dye. [ 48 ] The Venetian ability to produce this superior form of glass resulted in a trade advantage over other glass producing lands.
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The molten glass was poured into a mold of wood or stone to make a sheet of glass. The texture of the mold material would be picked up by the glass. By the time stained glass was being made, the glassblowing pipe was in common use, so hand-blown (or mouth-blown) sheets were made by the cylinder glass and/or crown glass method.
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