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| Glossary Page Under
Construction |
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| The chemical composition of wood ash is similar to
that of a glaze, primarily alkaline fluxes, alumina
and silica. This could be called a natural
glaze, however few ash types make a glaze alone and
they are usually mixed with other glaze materials;
however in a wood fired kiln the action of the ash can
produce a glazed surface upon the fired objects. |
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| A sedimentary clay that will withstand high
firing temperatures. Plastic in quality. |
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| Clay that has been given a preliminary firing to render it hard enough for further work such as decoration and glazing. |
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| An earth material treated by heat to
form and produce objects or materials of benefit
to humanity. Such as bricks, glass cement,
pottery, sculpture, computer chips, insulation,
etc.. The list goes on and on. |
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| A gray-green glaze, usually pale in color. |
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| Porcelain. The first porcelain imported into Europe was from China. |
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| Kaolin. A white clay being close to the
chemical ideal of pure clay or kaolinite,
lacking the impurities that color other clay
deposits. |
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| Hydrated silicate of aluminium, or mud, a
plastic material when wet capable of being
molded into shapes that become hard and
impervious to water after being heated. |
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| A clay formula that is designed to meet
specific criteria, can be natural occurring or
made. |
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| Rolled clay in flat form or with a rounded section that welds to itself.
Coils are used to build clay forms, one of the
the three basic hand building techniques. |
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| Cones are small objects composed of ceramic
materials. They are placed into a kiln to
be fired and reveal the progression of heat work
on clay objects during the firing. Cones, are
manufactured by the Orton
Ceramic Foundation in the US. |
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| Cracks in a glaze surface resulting when the
thermal expansion of the glaze do not match the
thermal expansion of the clay body, used as a decorative
motif at times. |
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| A glaze fault, shrinkage or retraction of the glaze during drying and firing, causing exposed areas of clay body after firing. Can be used for a glaze effect called
leopard skin. |
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| A fine network of cracks in the glaze usually caused by uneven contraction and expansion of the
clay body and the glaze during changes of temperature. In some pottery this is a design feature rather than a fault (See -
Crackle). |
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| Cracking or breaking of fired objects, caused by
silica inversions at lower temperatures. |
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| Objects that are porous when unglazed, up to 15%
water absorption. Usually fired at low temperatures. Earthenware is softer and more easily damaged than stoneware. |
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| A liquid clay slip containing metallic oxides or
glaze stains applied to clay objects before firing
for decoration. They can be covered with a
glaze or used alone. |
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| Glassy alumina silicate surface applied to clay
and fused by heat, composed of earthy materials
and metallic oxides for color. |
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| A studio furnace for firing clay; studio kilns
can achieve temperatures of up to 2500F (1371C)
depending on their construction materials.
They can be fueled using carbon, organic matter or
electricity |
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| Dense and strong high fired clay that has a
substantial glaze clay interface and exhibits a
water absorption of less then 1%, usually white. |
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| High fired clay that exhibits a noticeable clay
glaze interface and has a water absorption of less
then 5%, can vary in color. |
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