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| Any vitreous that has been melted onto a clay surface byt the use of heat and is composed of silica(glass former,) alumina (stifferner) and flux. |
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| pertaining to or made of glass, glasslike |
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| the natural mineral (like red iron oxide) or commercial ceramic stain that is added as a percentage to the glaze formula. |
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| the proportion of actual weights of the raw chemical componds that make up the glaze for a specific temperature. |
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| a catalyst that lower the melting or fusion temperature of another material |
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| a glass that is commercially made by melting a flux (either soluble or toxic) with silica. Used as a component of glaze production. |
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| the first low temp. firing between 1650 and 1950 degrees F.) of clay which renders it porous, relatively strong and easy to glaze. |
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| the firing of glaze coated bisque work, usually to a higher temp. that makes the clay body dense, hard, and vitreous or glasslike. |
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| the thermal crack that is a result of uneven temp. application. It occurs at 1062 degrees F |
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| the compound in the glaze that produces glass. |
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| the compound in the glaze that lessens the elasticity of the glass and helps tp prevent the glaze from running |
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| a clay infused with soluble salts that act as a flux to produce a "self-glazing" clay. Oldest glaze known and found in Egypt from 5000 B.C. |
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| very low temp. melting glaze and discovered in the Near East around 1000 B.C. toxic |
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| discovered in China in association with high temperature Kiln technology. can only be used above 2150 degrees F |
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| a naturally occuring clay that has sufficient flux in it to becomes a glaze when fired to high temp. Albany clay from NY is an example of this type of clay. |
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| a colored clay slip applied clay to the surface of pottery or sculpture to change its color and/or texture. |
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| a glaze compose primarily of feldspar used in high temp. stoneware ceramics. By itself, feldspar, when fired to a high temp. (2300 degrees F, will yield a milky white glaze.) |
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| an old fashioned term that refers to the cool, gray/green/blue color of a high temp. glaze when fired in reduction, iron is the colorant. |
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| refers to the efficient combustion of a fuel. Ample amount of oxygen is available so that the most energy is released. The flame is characterized as being short and cule in color. |
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| refers to the inefficient combustion of fuel, that is, not enough oxygen is available for combustion. The flame is characterized as being orange, long and smoky |
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| is produces in a reduction firing. It is "unstable" and will steal oxygen from the oxides that comprise the clay and glazes of the ceramic work thus changing their color and texture. |
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| three items are necessary for this process to occur: furl, oxygen, and ignition temp. |
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| transfers of energy from one place to another through the process of heated airrising |
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| transference of energy through physical objects just as ceramic objects and materials |
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| emittance in all directions of energy from its source to surrounding enviroment. The hot kiln "radiates" energy |
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| the electromechanical device that indicates temp. at a certain moment in time. |
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| the bimetal probe inserted into the kiln that produces a small electrical charge when heated |
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| the tetrahedron shaped device manufactured by Orton Cone foundation that is placed inside the kiln to record the affect of heat over time on the ceramic materials. |
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| the first of three cones that indicate that glaze temp. is almost reached. |
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| the second cone that is the temp. at which the clay and glazes mature |
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| the third cone that indicates whether or not the kiln has been over-fired. |
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| a plaster, wood, or plastic disk or slab used support wet clay. |
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| the act of forcing a lump of clay by hand into a symmetrical form at the center of a spinning potter's wheel in preparation for throwing pottery. |
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| a furnance or oven built of heat-resistant materials for firing ceramics items |
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| that process of in suring that no glaze remains on the bottom of the pot do that it will not fuse to the shelf durign firing . Sometimes wax ressit medium is used as an aide to prevent the glaze from fusing the ware to the shelves. |
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| the opening in the kiln opposite the site where the cones are placed |
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| the temp. 91062 degrees F) at which dunting occurs |
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| a white, high temp. clay body |
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| a red, low temp. clay body colored by iron oxide |
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| a high temp. clay body colored by less than 2% iron oxide |
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