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<p>[QUOTE=&quot;desertgem, post: 24664534, member: 15199&quot;]From my ceramics courses I taught for a couple of years and was in charge of the Kilns . We just used clay. no metals, but both have to have constant temperature </p><p>over a time long enough so the internal metal ( or clay) is equal temperature&nbsp; before&nbsp; we start to time it. Even though we had a single high level thermometer ( 2500),</p><p>we used &quot;ceramic cones&quot; on each level so we could tell if the temperature was even and constant all around. When the peak of the cone started to bend down, we would be at temperature, and maintain it. When the tip curled down and touched the plate, it meant the temperature was correc at all levelst. Depending on the thickness of the walls of the piece we would time it and when done, turn off the heat ans let it set all night to cool down slowly. Cones are on Amazon. If I ever sub for the class from now on, I will use an infrared sensor gun, much easier! ( also on amazon)</p><p>&nbsp;&nbsp; I mention this as it was possible that the heat was not totally dispersed evenly.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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