As I said in my post I never even considered making mokume in the forge. Since the issue seems to be the copper, or other non-ferrous metals releasing a gas that ruins the ceramic blade or other insulation.
Just how does it "ruin" the insulation? Is it because the copper gas gets in the insulation and ruins the insulation property of the insulation so it doesn't do a good job of insulation?
Based on this I suspect it's not a good idea at all to use the forge for melting copper or brass to cast up a fitting either. I have been thinking about trying that, but won't be doing that now. Thanks Ed.
Ken H>
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