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This is a cone 10R stoneware, Plainsman H550. Made by Donna Ratlege at Spirits of the Creek Pottery in Cranbrook, British Columbia. She titles these: "Honest! I just had it". Her new super-powered gas kiln, built by Bruno Sperling, went over temperature on the first firing. These were in different parts of the kiln, each bearing witness to the degree to which it went past cone 10. This clay body should not be fired to lower than 1.5% porosity or bloating can occur. These are a testament to Bruno's kiln-building and firing ability, these pieces have even gone beyond that - far enough to seriously warp.
Troubles |
Warping
There are multiple reasons why pottery and porcelain pieces can warp during firing, both vitreous and non-vitreous ware. Here is what to do about it. |
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