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Red iron oxide in a high temperature reduction fired glaze

Copper can produce bright red glazes in correct reduction firing

copper oxide in a transparent oxidation glaze

Cobalt in a transparent glaze

This is what about 8% iron can do in a transparent base glaze with slow cooling at cone 10R on a refined porcelain.

Flow tester demonstrates how zircon opacifys and stiffens a glaze melt

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