Tin oxide stops crystallization in GA6-A Alberta Slip base glaze

Thursday 8th October 2015

Both of these mugs were soaked 15 minutes at cone 6 (insight-live.com/glossary/340">2200F), then cooled at 100F per hour to 2100F and soaked for 30 minutes and then cooled at 200F/hour to 1500F. This firing schedule was done to eliminate glaze defects like pinholes and blisters. Normally the GA6-A glaze crystallizes (devitrifies) heavily with this type of firing, but an addition of 1% tin oxide to the one on the left has prevented this behavior.

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Tin Oxide, GA6-A - Alberta Slip Cone 6 transparent honey glaze, Crystallization

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