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Product Description

Size: Pint
Cone 6
Food safe

Our most popular series, you can achieve stunning and amazingly varied results with a single glaze, or truly spectacular effects by layering over other glazes. This series is more demanding, the application is critical; too thin and they can be ugly, too thick and they will be runny. Each clay and glaze have their own expansion (and contraction) rate, and if they are too different problems can result. At about 1000 degrees F. the glaze solidifies, and the clay and the glaze undergo contraction side by side. The most common fit problem is crazing, caused by the glaze contracting more than the clay body on cooling. This means the glaze is stretched over the clay, resulting in a crazing or crackle pattern. Although there is some evidence that crazed glazes may result in a weaker finished pot, the main concern is aesthetic, and many people just ignore it. Of much more concern is the opposite problem of shivering. In this case the glaze contracts less on cooling than the clay body, putting the glaze under compression. Some compression can be a good thing, resulting in a stronger pot, but too much can cause the glaze to flake off the pot (shivering). In extreme cases this condition can cause the pot to break (shattering). It is important to realize that this might not happen for days or even weeks after work comes out of the kiln, so do your testing early. Expansion/contraction is often confused with firing shrinkage, which is irreversible. Expansion is temperature dependant and occurs with each heating and cooling. Shrinkage doesn't tell you anything about the expansion rate. Some high shrinkage clays have a low expansion rate and vice versa.

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