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residual salt/soda

Posted On May 29, 2009 0 Comments
In a well-used salt/soda kiln, the light salt/soda effect that may be obtained by firing wares in the kiln without introducing any additional salt or soda, due to the revolatization of salt/soda from the walls of the kiln. Source: Clay: A Studio Handbook

residual ash

Posted On May 29, 2009 0 Comments
In a wood kiln, the surface effects created by fly-ash settling upon the wares. Effect is maximized by turbulence in firebox, considerable draft through kiln, and/or active stirring of the coal bed. In short wood firings ash doesn’t have time to melt, and leaves a rough, crusty surface. Source: Clay: A Studio Handbook

reoxidation

Posted On May 29, 2009 0 Comments
In a reduction firing, oxidation that occurs after fuel is shut off at end of firing. Source: Clay: A Studio Handbook

registration marks; keys

Posted On May 29, 2009 0 Comments
In plaster slip-casting molds, small rounded depressions carved in each parting face of a mold segment, so that when adjacent segments are cast a corresponding bump will form. In use, the keys allow the mold segments to be aligned and assembled securely after the original prototype is removed. Source: Clay: A Studio Handbook

refractory

Posted On May 29, 2009 0 Comments
Capable of withstanding very high temperatures. Source: Clay: A Studio Handbook

refractories

Posted On May 29, 2009 0 Comments
Any materials highly resistant to the effects of heat. In kiln construction, high-temperature insulating materials, such as firebrick, ceramic fiber, etc. In clay and glaze chemistry, the neutrals or stabilizers that are resistant to melting and that combine with the fluxes (bases) and glass-formers (acids). Primary refractory material in ceramics is alumina, most often introduced… Read More »

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