"I work with two general glass types in production, soda lime and borosilicate. The glass I use depends on what color I want. There is a wider selection of transparent colors with the soda-lime glass, but is limited in scale up to half an inch. Borosilicate glass is available in larger sizes but with no color, or with a color accent or sandwich like the borosilicate plugs. It is much easier to work the borosilicate glass on a torch because of its greater resistance to thermal shock. The soda lime glass requires more sensitivity to work, and greater care in annealing properly. It is a complete myth that you cant autoclave soda lime glass. Both borosilicate and soda-lime glass are non-porous, easy to clean, and odorless, which are all excellent characteristics for piercing jewelry." - Jason Pfohl -- Gorilla Glass
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