so not worth the effort. i fired them with a plaster ring sizer and apparently the bronz/carbon combo does not like the addition of plaster in the firing. they came out blackish with a little blue patina...and chunks of the plaster permanently adhered themselves onto the inner ring surface. regular sanding did not remove the blackish-blue. filing vigorously did.
also, bill struve showed us at the conference that for some reason bronzclay shrinks only minimally if it is in a circle, as opposed to a flat piece which can shrink significantly (20%, i think). well, i put a size 9 ring sizer in there, and took size 7.5-8 rings out of the kiln....hmmm....
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