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reduction firing

Posted On May 29, 2009 0 Comments
In fuel-burning kilns, firing atmosphere with insufficient oxygen to completely combust fuel, introducing abundance of unoxidized carbon and hydrogen, which extract oxygen molecules from surface of wares, altering appearance of clay and glaze. See climbing reduction. Source: Clay: A Studio Handbook

reduction cooling

Posted On May 29, 2009 0 Comments
In a fuel kiln, maintaining slight reduction atmosphere during cooling cycle, from maturing temperature down to approximately 1400° F, in order to minimize reoxidation of clay and/or glazes. See reoxidation. Source: Clay: A Studio Handbook

reduction

Posted On May 29, 2009 0 Comments
Chemical reaction in which oxygen atoms are removed from a compound. Source: Clay: A Studio Handbook

reducing agent

Posted On May 29, 2009 0 Comments
Material such as silicon carbide used in clay or glaze to create localized reducing conditions in an oxidation firing. Source: Clay: A Studio Handbook

reduce

Posted On May 29, 2009 0 Comments
To induce reduction. Source: Clay: A Studio Handbook

red-figure style

Posted On May 29, 2009 0 Comments
In ancient Greek ceramics, Classical stage of vase painting, featuring figures in red against black background, with highlights painted in black and white. Source: Clay: A Studio Handbook

Redart

Posted On May 29, 2009 0 Comments
Brick-red earthenware clay, produced by Cedar Heights Clay Company. Source: Clay: A Studio Handbook

red lead; lead oxide

Posted On May 29, 2009 0 Comments
Pb3O4—Former source of lead for glazes. Highly toxic in absorption, inhalation, and ingestion. Remove from studio and dispose of in a responsible fashion. Source: Clay: A Studio Handbook

recrystallization

Posted On May 29, 2009 0 Comments
During initial cooling, the formation of microcrystalline or macrocrystalline structure in the glaze surface. Source: Clay: A Studio Handbook

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