This week, I borrowed a glass cutter and tried my hand at making drinking glasses from used wine bottles. Step one was scoring the bottles with the cutter.
Step two was soaking the bottles in ice water.
When the bottles were properly chilled, I took them out of the ice water and poured boiling water over them. The idea was that the rapid hot cold shock to the glass would break the bottle along the line that was scored with the glass cutter.
These are the best of the bottles that were cut. As you can see, it sort of worked, but in actuality didn't. "Sort of" isn't good enough for this project. There must have been over a dozen bottles/glasses that were even more dangerously jagged than these in the photo, which would make drinking from them most unpleasant.
Of course, drinking from these glasses was the goal, which obviously isn't going to happen. The project was fun, exciting, and tedious work with nothing to show for it in the end. Oh, well.