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| refractory material in glazes |
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| plastic, fine-grained, secondary clay used in clay bodies to increase plasticity and in glazes to add alumina |
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| rubbing leather hard or dry clay with a smooth tool to polish it, smooth the surface, or compress the clay particles |
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| applying glaze or slip to a pot by immersing it and shaking off excess glaze |
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| a kiln in which the heat moves up through the firing chamber, down through the ware, and then is vented into a chimney opening at the bottom of the kiln |
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| pottery that has been fired at a low temperature, is porous, and relatively soft. Usually red or brown colored. |
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| slip used for decoration; slip applied over entire surface of a piece to change the color or texture. |
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| clays that withstand high temperatures. Used in kiln bricks,as ingredients in stoneware bodies or in clsy bodies for hand building. |
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| substance that lowers the melting point of another substance. Oxides which combine with the silica and other heat resistant materials in a glaze to help them fuse. |
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| any vitreous coating that has been melted onto a clay surface using heat. Can be matt or glossy. |
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| The firing during which the glaze materials melt and form vitreous coating on the clay body surface |
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| crushed particles of fired clay added to a clay body to help in drying, add texture, and to reduce shrinkage and warpage |
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| condition of a clay body when a lot of the moisture has evaporated and shrinkage has just ended, but the clay isn't totally dry. Craving, burnishing, or joining slabs are done at this time. |
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| temperature and time at firing in which a clay or glaze reaches the desired condition of hardness and density. |
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| firing of a kiln or open fire with compete combustion so that the metals in the clay and glaze produce their oxide colors. Usually associated with electric kilns and bright and clear lowfire colors. |
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| ability of a damp clay to yield under pressure without cracking and to retain the formed shape after pressure is released. |
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| i.e residual clay. Clay found in nature that was formed in place rather than transported by the actions of water |
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| a device for measuring and recording the interior temperature of a kiln. |
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| tea ceremony ware. Refers to the process of raku firing and to ware glazed in such a firing. It is lead glazed, placed in a red hot kiln, and quickly removed when the glaze melts. It is then reduced after firing by burying it in combustible material and then covered with an airtight lid. This produces luster or opalescent colors. |
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| Firing in which insufficent air is supplied in the kiln for complete combustion. The CO combines with the oxygen in the oxides of the clay body and glaze causing the oxides to change color. |
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| natural clay that has been moved by wind or water from its source and settled elsewhere in deposits. |
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| oxide of silicon. Most common of all ceramic materials; found in quartz or flint sand. |
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| a suspension of clay in water used for casting pottery in molds |
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| a type of clay body fired to a temperature at which the body becomes vitrified, dense, and nonabsorptive. |
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| a low fire, porous, reddish clsy body, frequently containing grog or other temper. |
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| a kiln in which the heat goes up through the chamber and is vented through the top. |
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| a method of decoration in which melted wax or oil emulsion is painted onto a clay body or a glazed piece |
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| kneading a mass of clay to de-air it, get rid of lumps, and prepare a homogeneous material |
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| process of firing at a low temperature, usually from cone 010 to cone 05. |
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