I've been doing my homework getting ready to make a ground glass or two, and have a question. It's popular for people to use a smaller square of glass to grind the ground glass, using aluminum oxide as the grinding compound. But I was curious... if one used a 5x7 piece of glass to grind another piece of 5x7 glass, would one end up with two serviceable 5x7 ground glasses? Enquiring (and lazy) minds want to know...
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