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What is Bat wash?

Waxing

We need to wax the bottom of the piece. Any part of the piece that will come within 1/4" of the kiln shelf should not have any glaze on it. This is called dry footing. Melted glaze acts like a glue when it comes between two surfaces. If there is any glaze on the bottom of your piece, it will become glued to the kiln shelf in the firing. At worst it will have to be removed with a hammer and chisel, and the kiln shelf will be ruined.

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