I woke up today with a need for crackled marbles. No project in mind, just "I need me some crackled marbles, I doodly do." I'm learning to roll with these things when they hit, so I set about crackin' some glass, baby!
But here I sit with two broken marbles (also pretty, but not my goal) and roughly 90-plus still uncrackled marbles. Two methods I've tried didn't work very well--boiling, then ice water; baking, then ice water. Each method broke 1 marble. That's it. Dammit. Now I'm going to try what I observed at The Glass Works here in town. I'm baking the marbles for a really long time at 350(no, there's no way in my oven they'd get hot enough to melt), and then will put them in a closed metal container and wait for them to cool on their own. That oughta do it.
If it doesn't, then I'll think of something else. Fricaseed marbles, anyone?
ETA: I've got a few gorgeous crackly marbles, yays! I hope most of them pop and crack as they cool. Now I just need to figure out what to do with them, besides looking at them. 'Cause they's prettyful.