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I have a lot of glass bottles and jars. I want to convert them into new items of different styles and shapes. Can a glass object be molded into a new shape by melting? If yes, then how?

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Yes, The general term is 'bottle slumping'. There are several images on pinterest. The glass is heated to the point that it can be shaped. Current trends are to use a Kiln, with temperatures between 500F and 1500F

I have memories from local carnivals in the 1960s and 1970 of the bottles being heated in a liquid, shaped and given as prizes or sold. I had a coke bottle for several years that was obtained from the carnival.

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I wouldn't recommend it. Glass especially bottles/jars can explode when heated like that sending pieces of hot glass flying in all directions I recommend getting a good art and craft kit specifically for glass.

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