I was told that if I plan on encasing green or anything that sparkles I should garage at 975°. I haven't had a problem with any green since then. Anything with a heavy chromium content will not do well if you garage higher than that. I know it didn't for me. Long garage times at 975° can become a problem also. It seems like that's more of a problem for the sparkly stuff though. Obviously you don't want to overwork them either.
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Gary
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