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Stained glass is a term that refers to both the material of colored glass and to the art and craft of working with it. As a material the term stained glass generally refers to glass that has either been painted and fired, or colored by adding metallic salts during its manufacture, and often both. The latter process is exemplified by, for example, the use of copper to produce green or blue glass or gold oxides to produce reds and oranges.
Stained glass, as an art and a craft, requires the artistic skill to conceive the design, and the engineering skills necessary to assemble the decorative piece, traditionally a window, so that it is capable of supporting its own weight and surviving the elements.
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