How to crack marbles:
Grab clear glass marbles (you won't see the cracks on solid coloured ones anyway) and place them in the oven, preferably in something with sides so they won't roll off. Heat oven to at least 260°C and leave the marbles in maximum temperature for 20 minutes. Bring the marbles out of the oven and quickly place them in icy cold water. There's some magic for you! (Or well, at least glass mechanics, but magic is more fun.)
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