Stained glass fusing
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Stained Glass fusing is the art commonly used to blend certain glass pieces/colors together. This is most commonly done in a kiln. Two or more pieces of glass can be laid on top of each other and fired at temperatures ranging from 1100 degrees Fahrenheit to 1500 degrees Fahrenheit. Certain types of glass cannot be fused together. For example, a type of glass called 96...cannot be fused with a piece of glass by the number of 90. The glass will shatter or crack while being fired.
Little pieces of glass, about a millimeter on all perimeters, can be fired into a bead and then many can be glued onto a flat piece of glass, and fired to create an optical glass creation. These beads must be heated to approximately 1300 degrees Fahrenheit.
The fusing of glass can be used to combine types of glass. Instead of fitting glass together using lead, one can fuse the pieces together or on top of each other -- for example, in creating eyes, with the black pupil on top, fused into the white eye base.
This glass can be bought at stores that specialize in art glass.
Glass is prone to melding into whatever shapes one allows when in the kiln.