Learning to do a stoneware test grid using Ian Currie's method for testing fluxes, alumina and silica ratios.
This is a Cone 6 Base Glaze.
Calculation page here.
Work out the flux ratios you want to use and then add them at the top. Click calculate and you have your formula. The Horizontal scale moves from C in the bottom left corner right towards high silica and upwards on the vertical plane towards high alumina.
Fluxes used are Frit 4124, Potash feldspar and Whiting.
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