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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...See more oxidizing the alloy prior to opaquing, even if you then blast off the oxide layer before you apply 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...See more thing:
First, I use specific finishing/grinding tools for each metal and I don't cross contaminate. When using stones, I only use aluminum oxide.
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