When a digital kiln is taking longer than usual to complete a firing, how do you know whether something has gone wrong and the kiln is over-firing?
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You should place pyrometric witness cones on the shelf so that you can see them through a peephole. (Please see the “Pyrometric Cones” FAQ section.)
Here's another way to help prevent an over-fire: Learn to estimate kiln temperature by the color of light showing around the lid and peepholes. That way, you can tell at a glance if all is well with your kiln when you check it.
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