In article , Bob Masta writes
This probably true, and consequently any damage would be minimised if not corrected in the latter stage of the same firing. Frankly I don't know for certain but I suspect it is so; we operate a firing service for customers who don't have their own kilns, and sometimes the larger sculptural pieces do contain paper which has not been completely removed, which results in a seriously smokey workshop, but it doesn't seem to affect the kiln elements adversely. However prolonged reduction would damage them.
Interestingly I have noticed that the atmosphere in a kiln at the end of any stoneware electric kiln firing is almost in reduction, certainly past being neutral, and if ash glazes are used in any quantity it is positively reduced; a friend who uses ash glazes exclusively goes through elements way faster than we do.
Steve Bath UK