Is it possible you are
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June 12, 2014 at 7:48 pm #13374
Inactive
Is it possible you are seeing this:
http://www.bullseyeglass.com/methods-ideas/special-effects-steel-blue-opal.html
If so, you can (carefully) clear-cap the glass with a very thin layer of clear powder and it will eliminate the oxidization that you are seeing.
Paul
FusedGlass.Org
Helios Kiln Glass Studio
PaulTarlow.com