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Warm glass or kiln-formed glass is the working of glass, usually for artistic purposes, by heating it in a kiln. The processes used depend on the temperature reached and range from fusing and slumping to casting. 'Warm' glass is in contrast to the many cold-working glass processes, such as leaded glass. 'Hot' glass, glass blowing or lampworking is the working of glass in a direct flame, such as for laboratory glassware and beadmaking. == Processes == Warm glass working uses a variety of processes, according to the working temperature and the time the glass spends at this temperature. The glass becomes progressively softer, less rigid and less viscous with temperature. Kiln-worked glass (unlike lamp working) responds slowly though, and so the amount by which this affects the glass depends on the time it spends at working temperature. There are three main processes, with variations within them. The broad process depends on the temperature, the variation within it depends on the time and also on slight variations of temperature. These processes are: * Fusing : The glass retains its shape, but becomes sticky and adjacent glass pieces join together. * Slumping : The glass deforms in shape, becoming flexible but still retaining its approximate solid form. * Casting : The glass melts, becoming a viscous liquid that takes its shape from that of its containing mould. It is common for one piece to use several of these processes in turn. Coloured glass may be fused together to make a composite multi-coloured sheet. This glass is then cut cold and re-assembled in pieces, which are then fused back together. The piece is finally slumped into a mould to shape it. Glass is usually worked for only one process in a heating cycle. Where a piece requires multiple cycles, it is returned to a lower temperature between them. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Warm glass」の詳細全文を読む スポンサード リンク
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