Warm glass or kiln-formed glass is the working of glass, usually for artistic purposes, by heating in a kiln.
The process used depends on the temperature reached
and ranges from fusing and slumping to casting.
The glass becomes progressively softer, less rigid and less viscous with the time spent at working temperature.
There are 3 main processes:
FUSING - The glass retains its shape, but becomes sticky and adjacent glass pieces stick together.
SLUMPING - The glass deforms its shape, becomes flexible but still retains its solid form.
CASTING - The glass melts, becoming a viscous liquid and takes the form of its containing mould.
It is common for one piece to use use several of these processes in turn.
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