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Crystalline Glazes at the Higher Fire Studios
Dan Dermer, owner of Higher Fire Studios in San Jose California, fires a special oxidation load once a month to Cone 10 in his Bailey PRO 40 AutoFire gas kiln. His students and resident potters get to experiment with cyrstalline glazes, as well as, oilspot. and other glazes that respond best in oxidation firing.
The crystalline pieces shown below are from a recipe from Fara Shimbo. Dan uses the same recipe base, and adds variations and combinations of copper carbonate, and cobalt. Because crystalline glazes are runny, his students use a standard glaze on the underside of the the bowl and platters, with the crystalline only on the inside.
After reaching cone 10, the kiln starts the cooling cycle until 2090 F, where the program holds the temperature for 1 hour. After that, the load cools naturally.
The results are wonderful!