All good information above.
And yes, I just came from a class and it was repeated many times "never touch hot glass with a cold tool"
You can just waft it in the flame a couple of times before touching the hot glass, you don't want it red hot or anything.
Also, what color were you putting in the marbles? The hot colors (reds, oranges, yellows) do not like being encased for example.
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My current "hot" fantasy involves a senior discount on glass & tools!
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