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G1916QL1 brushing glaze fired to cone 06, 05, 04

The same mug fired at increasing temperature declouds the glaze and darkens the color of the terra cotta body. Two coats of the G1916QL1 transparent glaze, prepared as a brushing glaze, were initially applied to this Plainsman L215 terra cotta. The extra cone, and the 60F degrees that go with it, greatly helped to clear the bubble clouding by cone 05 (center). But 60F more degrees, to cone 04, both darkened the terra cotta clay and further cleared the bubbles.

Bubbles in terra cotta clear with temperature

Related Pictures

2% iron oxide in a glossy terra cotta glaze gives better color, less clouding


Two brilliantly transparent glazed terra cotta mugs

Both pieces are the same clay body, Plansman L215. Both are fired to cone 03. Both are glazed using G1916Q borosilicate recipe. The glaze on the piece on the left has 2% added iron oxide (sieved to 80 mesh). Each particle or agglomerate of iron (which is refractory in this situation) acts to congregate the micro-bubbles so they can better exit the glaze layer. Notice also how much richer the color is as a result. The piece on the right, without the added iron oxide, is neither as red nor as transparent. Of course, I had to be careful not to apply the glaze too thickly on both.

There is a secret to the clarity of this terra cotta glaze


Two clear glazed terra cotta mugs

The body is Plainsman L215 and the glaze is G1916Q. Both were thinly applied and fired using the 04DSDH schedule. The glaze has 2% iron oxide added and sieved to 80 mesh. The iron reddens the color and its particles act as a fining agent to reduce micro-bubble population. The one fired to cone 03 (left) is considerably stronger, better surviving the stress of successive impacts with a hammer. However, it has minute surface dimples, likely from decomposition beginning in the body. The mug on the right fired to cone 04, only slightly above the 05 bisque. The glaze surface is much better, almost crystal clear. A big advantage of cone 04 and cooler is that ware can be fired on stilts (enabling glazing the bottoms).

Links

Troubles Clouding in Ceramic Glazes
There a many factors to deal with in your ceramic process to achieve transparent glazes that actually fire to a crystal-clear glass

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