KindUnderglazeFiringHigh fire, Cone 06–10MakerSpeedball
Food safety depends on the clay, the application and your kiln. Treat any maker's claim as a starting point and test your own work before using it for food or drink.
Photo and details from speedballart.com.
From the supplier
LineGlazes + Underglazes
From potters
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On real work
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