Quote:
Originally Posted by dragonart glass
I may be conservative but I don't take any boro out until it's below 200 degrees and not even then for marbles...I've watched it crack. Just because it can take the stress doesn't mean it's not in there.
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I always let it cool completely down before I open or vent the kiln at all.
Because I do have a polariscope. It is better to be safe than sorry and not get in a rush for any reason.