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October 10, 2008, Newsletter Issue #314: Firing down for high fire glazes
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Tip of the Week
Mid to High fire glazes often look better if they are cooled slowly. For this reason 3" brick is preferable for high firing. However, it is possible to slow down the cooling by "firing down". With a manual kiln, when you would normally turn the kiln off, instead turn the switches down to medium. With an electronic kiln, you will want to program this ahead of time. As an example, your last segments could allow rapid cooling to 1950 degrees F, a 30 minute hold at that temperature, then slow cooling at a rate of 150 degrees per hour down to 1100 degrees F. At that point the kiln would turn off.
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