I played around with them a bit about a year and a half ago and got pretty much the same results as you. It's still in the cabinet and eventually I'll get around to trying it again. I suspect that I got the bits too hot after I finally adhered them to the glass and encased. It is, after all, a hydrated silica,so lots of heat will break it up and give you bubbles (but we know that now).
Robert
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