Why not find a friendly
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January 19, 2012 at 5:53 pm #12394
Participant
Why not find a friendly ceramics person who will let you fire something you have already done in their kiln. Then you can lcompare results. I think the marking mentioned is more likely to be devitrification due to slow cooling, than residues from the glazes, which have a lot of glass as well as metals in them.
Stephen Richard
blogs at: http://www.verrier-glass.blogspot.com/ and http://www.glasstips.blogspot.com/