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A possible contributing factor to bubbling is the firing temperature of your first opaque cycle relative to the oxidation cycle temperature. If you are oxidizing the alloy prior to opaquing, even if you then blast off the oxide layer before you apply...See more opaque it is very important that your first opaque...
It's most likely from contamination somewhere in the process of conditioning and opaquing, as I'm sure you realize. Here's what I do to avoid the same thing:
First, I use specific finishing/grinding tools for each metal and I don't cross contaminate....See more When using stones, I only use aluminum oxide.
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