Your best bet is probably to
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September 11, 2009 at 4:21 am #11401
Your best bet is probably to burn off the soot by firing the kiln to about 900F and holding it there until the black disappears. You will want to shim the lid about an inch open on one side and make sure the area is exceptionally well vented. Outside would be best.
Helios Kiln Glass Studio