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A hard, transparent material, made from silica (sand, quartz, or flint), an alkaline flux (such as potash or soda), and other ingredients such as limestone or potash of lead, which fuse when heated to a high temperature. In its hot, molten state, the glass, or ‘metal’ as it is known, can be drawn into long threads, blown into bubbles and shaped with tongs, and blown into a mould or press-moulded.

Text source: The Oxford Concise Dictionary of Art Terms (2nd Edition) by Michael Clarke

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