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raw glazing; green glazing

Posted On May 29, 2009 0 Comments
  Glazing leather-hard or bone-dry wares for single-firing.   Source: Clay: A Studio Handbook

ramp

Posted On May 29, 2009 0 Comments
Profile of the firing of a kiln, including speed, duration, soaking periods, etc. of both the heating and cooling cycle, as in firing ramp and cooling ramp. Source: Clay: A Studio Handbook

raku (western)

Posted On May 29, 2009 0 Comments
Inspired by traditional Japanese raku firing, Western (typically referred to as American) raku is a relatively low-temperature firing process using clay that is either under fired or otherwise formulated to withstand the thermal shock of being removed from a kiln at top temperature. Work is removed from the kiln at bright red heat and subjected… Read More »

raku (japanese)

Posted On May 29, 2009 0 Comments

Traditional raku or Japanese raku is a low-fired glazed pottery by a direct process that involved putting the pots into and removing them from a red-hot kiln. The potter Chojiro is credited with being the first to produce raku ware in 1580. The term raku is translated as “enjoyment” or “ease.” From The Potters Dictionary of Materials and Techniques, by Frank and Janet Hamer. See raku (Western).

extruder, extrude, extruding

Posted On December 5, 2008 0 Comments
Machine that forces plastic clay through a die to produce extruded clay shapes. Source: Clay: A Studio Handbook

eutectic

Posted On December 5, 2008 0 Comments
Chemical phenomenon where two materials in combination melt at lower temperature than either material by itself. 

ergonomics

Posted On December 5, 2008 0 Comments
The science of comfortable and effective utility, determining how well a functional object or device works with the human body. Source: Clay: A Studio Handbook

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