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Pushing enough to break the walls off the base. The body is a high-manganese black-burning stoneware. It is not just the higher thermal expansion of the glaze that is putting it under compression (as evidenced by the vertical crack that is being pushed apart), but also the fact that the glaze is applied thickly.
Glossary |
Glaze Compression
In ceramics, glazes are under compression when they have a lower thermal expansion than the body. A little compression strengthens ware, too much can weaken and even fracture it. |
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