Using lead free glazes:
Make test firings of the body and glaze to their recommended cone number, first the unglazed body, then the glazed bisque.
Use witness cones placed near the ware to be sure the proper cone number was reached. Differences may exist between the Kiln-Sitter and a witness cone or from the top to the bottom of the kiln. Firing with a controller to a cone number or a temperature may not be adequate.

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