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Air which is trapped inside the body of the clay. This expands and can create explosion in the kiln. Wedging clay before use is a good way to avoid this problem.
A slab or platform on which clay is handled; a circular device attached to the wheel-head.
Unglazed clay, fired once at a low temperature. Ceramic piece will not blow up in firing.
The first firing of unglazed ware; this removes all moisture from the clay and prepares it for further steps like glazing. The approximate temperature of this firing is 1815 F.
The condition of unfired clay when it is as dry as possible prior to firing.
The act of aligning the clay on the potter’s wheel in order to proceed with forming and shaping.
A decomposed granite-type rock. To be classified as clay, the decomposed rock must have fine particles so that it will be plastic (see definition below). Clays contain impurities which affect color and firing temperatures.
A mixture of clay and other materials selected to produce particular characteristics to meet the ceramist’s needs.
Rope like pieces of clay that are stacked to form a wall and build the object. This technique is one of the most commonly used hand-building methods. The size of the coils can vary but must be slipped and scored into place or one side in blended to create strength.
A compound of materials that is applied to the surface of greenware or bisqued ware and that forms a glassy coating when fired.
Much hotter than a bisque fire. Firing to a temperature at which glaze melts to form a glasslike surface.
Typically the second firing that reaches temperatures at which glazes will melt. The approximate temperature of this firing 2300.
Pottery that has not fired. It is bone-dry, a state in which clay forms are the most fragile.
Ground fired clay that is added to a clay body to reduce shrinkage and warping.
One of the oldest craft techniques in which objects are constructed entirely by hand.
A furnace built for firing ceramic ware. It is built of refractor brick & heated by electricity, gas, oil or wood to temperatures from 1500 F to 2340 F.
Pillars and stilts which hold pieces during the 2nd firing. Shelves to make various levels within the kiln.