Did you leave the kiln
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May 14, 2013 at 1:49 pm #12916
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Did you leave the kiln closed until it got to room temperature? If so that would explain it.
Kilns cool very slowly as they get closer to the outside temperature – much slower than called for in the schedule. Most people (myself included) start venting the kiln when it gets to 500° F or so by wedging the lid open slightly with a little fiber board or similar. Just be careful not to go so fast you thermal shock your work.