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6c_6f_76_65 wrote

heat glass marbles slowly to 700 Fahrenheit. Rapidly cool in motor oil. They will have annealed poorly and shatter upon impact. Fascist love receiving these delivered via a slingshot.


6c_6f_76_65 wrote

Professionally, I would use one of my kilns. A fire built with hardwood charcoal would easily reach that temperature. A propane torch would give you the most control. If you just wanted raw heat then a rocket stove; dozens of builds and designs on YouTube.