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If you browse the images on his site some of the large sculptures, as well as table and counter tops, list "pyrex" as a material used.
That doesn't necessarily mean he has/had a furnace. Many look like they are cast from chunks rather than hot poured.
I'm still wagering you won't find a private studio with the infrastructure to melt boro from a raw batch formula. The bong suppliers are doing it with cullet.
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Temperature and time.
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