Skip over this if technical stuff bores you. For those of you who stuck around..The picture shows a kiln after a completed firing, or bisque—it is done at a relatively low temperature. Usually 1700-1950 degrees F. This is a slow process. The most number of accidents occur during this time—due to misfiring. If the temp in the kiln is taken too hot too fast it will cause explosion. Moisture can’t escape the clay fast enough. I usually candle my kiln (150-250 degrees F) at least six hours for sculpture to make sure all moisture has left the clay walls.