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epsom salts; magnesium sulfate

Posted On December 5, 2008 0 Comments
MgSO4—water soluble, rarely used as magnesium source in glazes. Most often used as flocculant for slips and glazes. Often added to porcelain and porcelaineous stoneware bodies (1/2 of 1% of dry materials weight) to counteract deflocculating alkalinity released by kaolins or fluxes. Source: Clay: A Studio Handbook

EPK; Edgar Plastic Kaolin

Posted On December 5, 2008 0 Comments
Al2O3×2SiO2×2H2O—pure white kaolin, less plastic than Tile-6 kaolin, frequently used in glazes. Source: Clay: A Studio Handbook

EPK, calcined

Posted On December 5, 2008 0 Comments
Al2O3×2SiO2—used in place of regular kaolin to adjust raw fit (reduce glaze drying-shrinkage) in glazes and engobes. Source: Clay: A Studio Handbook

envelope kiln

Posted On December 5, 2008 0 Comments
A kiln in which the firing platform is stationary, but the body of the kiln rolls out of the way horizontally on tracks. Often equipped with two firing platforms to be fired alternately. Source: Clay: A Studio Handbook

entrained air

Posted On December 5, 2008 0 Comments
Primary air drawn into an atmospheric burner, or mechanically injected into a power burner. Source: Clay: A Studio Handbook

engobe; underglaze

Posted On December 5, 2008 0 Comments
Colored slips formulated to have low drying shrinkage, allowing application to bone-dry or bisque-fired surface before glazing. 

enamels; china paints

Posted On December 5, 2008 0 Comments
Very low temperature (cone 018) glaze colors applied over a previously fired higher-temperature glaze. Allow greater detail, brighter colors than other ceramic glaze effects, but are vulnerable to surface abrasion. Source: Clay: A Studio Handbook


Posted On December 5, 2008 0 Comments
Any of a group of slightly over 100 substances on earth that may exist as individual atoms, and from which all materials on earth are composed. 

Egyptian paste

Posted On December 5, 2008 Comments Off on Egyptian paste
A self-glazing clay body in which soluble alkaline fluxes effloresce to the surface as the piece dries, and subsequently form a thin glassy coating in the firing. Source: Clay: A Studio Handbook

effloresce, efflorescence

Posted On December 5, 2008 0 Comments
Formation of crystalline deposits on surface of clay or concrete as soluble compounds migrate to surface during drying. See Egyptian paste. Source: Clay: A Studio Handbook