I've only been making beads for about a year but, one of the first things I was told is that CIM glass tends to shock easier. But, I never noticed a true difference between CIM and any other glass. I agree with the others in that it seems to be more by the individual color.
Any form of Goldstone tends to crumble for me, no matter what I do.
I've found that the easiest way to remedy a shocky color is to preheat the rod, if you can.
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