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This is what about 8% iron can do in a transparent base glaze with slow cooling at cone 10R on a refined porcelain.
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A cone 10 reduction stoneware clay containing iron stone concretions ground to 20 mesh
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Since iron oxide is a flux in reduction, overglaze iron based pigments run if applied to thickly
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Copper oxide (2%) added to an otherwise stable cone 6 glaze fluxes it considerably
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A cone 10 reduction tenmoku glaze with about 10% iron oxide.
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Red iron oxide in a high temperature reduction fired glaze
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Copper red shows the importance of correct firing (inside is red, outside is grey)
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copper oxide in a transparent oxidation glaze
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Cobalt in a transparent glaze
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Flow tester demonstrates how zircon opacifys and stiffens a glaze melt
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The fluxing power of boron (in borax): The two top clay bars contain 15% hydrous borax. At cone 06 it has melted and drained out of the bars, running down over the others as a glass.
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Metallic oxides with 50% Ferro frit 3134 in crucibles at cone 6ox. Chrome and rutile have not melted, copper and cobalt are extremely active melters. Cobalt and copper have crystallized during cooling, manganese has formed an iridescent glass.
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