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Jun 27, 2016 at 11:10 comment added Zeiss Ikon Most ordinary steel is too soft to scratch glass well, but work hardening can make even low-carbon alloys hard enough to get the job done with some persistence. The harder the steel, the better this works, however.
Jun 26, 2016 at 12:56 comment added CJ Dennis I once saw a man on a train "cut" the top of a glass coke bottle by using the metal lid. He scratched a line all the way around, then gave it a sharp blow and the top (the part with the screw thread) came away almost completely cleanly. The shape wasn't perfectly circular but he ended up with only two pieces.
Mar 10, 2016 at 7:36 vote accept kamuro
Mar 8, 2016 at 14:49 history answered Zeiss Ikon CC BY-SA 3.0