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Should I use the same cone number on the shelf as I use in the Kiln Sitter?

With most kilns, the small cone in the Kiln Sitter should be one cone hotter than the witness cone on the shelf. This is because the weight of the sensing rod makes the Kiln Sitter cone bend a little sooner. The witness cone on the shelf is a more accurate way to determine firing maturity than the cone in the Kiln Sitter, because the witness cone is right next to the ware. The temperature at the Kiln Sitter may be slightly different than at the shelf, and the Kiln Sitter could also be out of adjustment.

If the shelf cone of the correct number does not bend all the way, and the Kiln Sitter shut off properly, fire a hotter cone in the Kiln Sitter the next time. To fire to 06, you might try an 05 cone in the Kiln Sitter. If the shelf cone bends too far, fire a cooler cone in the Kiln Sitter.

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