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Glaze:
- glass-forming chemicals, usually with coloring compounds added, that is applied in a liquid form
- to bisqueware clay and fired in a kiln, forming a pleasing coating around the surface of the clay. When
- glazes are applied, they are usually not the color they will turn out to be. When fired, glazes go through
- chemical reactions, causing them to change color and turn to glass, fusing to the clay.
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Gloss Glaze -
a type of glaze which creates a shiny coating on a clay surface
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Matte Glaze -
a type of glaze which creates a flat coating on a clay surface
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Underglaze:
- colored slip, which is painted onto either bone dry clay or clay which has been bisque
- fired. After applied, a clear glaze is applied to the surface, which seals in the color and gives a glassy
- finish. Unlike glazes, underglaze usually remains the color it is when you apply it to the clay surface
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Crawling:
- a bare spot or the shrinking back of glaze on a ceramic surface, usually caused by dust or oil on
- bisque ware, or too fast of a warm up during firing
- Crazing: the cracking of the glaze on the surface of the pottery caused by cooling too fast or pooling on too thick
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Refractory:
ability for a material to resist high temperature
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Flux:
a melting agent causing silica to change into a glaze
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Grog:
fired clay that has been ground into course grains to help reduce shrinkage and warping
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Oxidation:
firing with a full supply of oxygen. Electric kilns fire in oxidation. Oxides show bright colors
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Reduction:
firing with reduced oxygen in the kiln
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