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CLAY GLOSSARY OF TERMS
Bisqueware: Any unglazed or underglazed ceramic piece that has been fired at a low temperature before glazing.
Bone-dry: A drying stage when your project is completely air dried and all the moisture is gone. Both white and red clay will become lighter and look "chalky."
Ceramics: Objects made from earthy materials that are transformed through a heat process. Also the process of making these objects.
Clay: A variety of earthy materials formed by the breakdown of granite rocks over millions of years.
Clear glaze: A clear coating that melts onto the clay surface with the use of heat. It will form a dull or glossy finish when fired to a certain temperature.
Greenware: Any unfired project that is bone-dry or leather-hard
Leather-hard: A drying stage that occurs after your project has been air-dried about one day indoors, or as fast as 20 minutes in direct sunlight. The clay stiffens and holds its shape, but can still be easily carved.
Kiln: A special furnace or clay oven designed to safely increase heat from 0 F to 1944 F, or cone 04 (and more for high firings).
Underglaze: Any coloring material used under a glaze. This is applied to greenware and then bisque-fired.
— from The Kids N’ Clay Ceramics Book,
© Kevin Nierman, Ten Speed Press, Berkeley, California, 2000
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