The oxide, opacifier and stain additions to the base glazes are given as percentages. It is easiest to treat the oxide percentages as an additional part. For example if the basic glaze recipe is weighed as: Alkaline frit 75g+china clay 15g+flint 10g=100g, and it also requires 1% copper oxide and 2% red iron oxide, the oxides would read as 1g copper oxide and 2g red iron oxide. This method is called a “Potters Percentage”.

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