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High Fire Glazes
Grid sets that contain glazes suitable for high fire.
These sets contain glazes that are suitable for around 1300 deg C. or around cone 10... plus or minus 50 deg C at least, or a couple of cones. Many of the glazes on these tiles will be better at higher or lower firings, to be determined by the experimenter. Although there is usually a best firing range for a particular glaze, there is no best temperature for any grid tile; any grid may be fired over a range of at least 100 deg. C, and at different temperatures, different glazes will reach their best result.
Ba/SrComparison1200px.JPG
Comparison of two grid tiles, identical in all ways except for the substitution (in the right-hand tile) of Strontium carbonate for Barium carbonate, weight for weight. Clay body and firing are identical.
Haarlem'06BaBl^3&^9ox1200px.JPG
Comparison of two grid tiles with identical sets of high barium glazes showing the temperature stability of barium matt glazes, Orton cone 3 on the left and Ortone cone 9 on the right, both fired in oxidation.
