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copper green glaze 03 fuming on to white glazes

updated sat 4 feb 06


Paul mcvicker on fri 3 feb 06

Does anyone have any experience with copper green glazes migrating(fuming)
to white areas of glaze next to them. This problem has just developed
recently. Firing to 1950(cone 03) and hasn't been a problem before. Tried
different copper carb's, pulling out materials one by one and some kiln
venting( venting with lid to kiln-electric- open 2"). Is there solution in
reformulating glaze to limit the fuming? Any help would be greatly