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draft

Posted On December 5, 2008 0 Comments
The flow of exhaust gases out of a fuel kiln, affecting intake of flames and secondary air. Source: Clay: A Studio Handbook

downdraft

Posted On December 5, 2008 0 Comments
Kiln where exhaust gases exit through flue at floor level. Source: Clay: A Studio Handbook

dolomite; calcium/magnesium carbonate

Posted On December 5, 2008 0 Comments
MgCO3×CaCO3—High temperature alkaline earth flux, promotes hard, durable surfaces and recrystallization/matting in glazes. Often added to claybodies to give longer firing range and can promote more durable low-fire bodies. Source: Clay: A Studio Handbook

dissolution

Posted On December 5, 2008 0 Comments
Action of a solvent material on a solid, bringing it into liquid solution. Source: Clay: A Studio Handbook

dispersoids

Posted On December 5, 2008 0 Comments
In glaze-melt, inclusions that disperse throughout the melt without actually dissolving into the glassy-phase. Source: Clay: A Studio Handbook

dispersion

Posted On December 5, 2008 0 Comments
Natural tendency of materials in liquid solution to go from area of high concentration to area of lower concentration, resulting in even distribution of materials throughout the glaze melt. Source: Clay: A Studio Handbook

devitrification

Posted On December 5, 2008 0 Comments
The phenomenon that occurs early in the glaze cooling cycle, when certain materials crystallize out of the vitrified (fused) mass. Source: Clay: A Studio Handbook

deposited clays; sedimentary clays; secondary clays

Posted On December 5, 2008 0 Comments
Clays that have been transported away from their point of geologic origins by wind or water. 

deflocculate; deflocculation

Posted On December 5, 2008 0 Comments
Process of adding an alkaline (usually) material (deflocculant) to a suspension, which introduces like electrical charges to all particles, causing them repel one another and remain in suspension. 

deairing

Posted On December 5, 2008 0 Comments
The process of removing the air from a plastic clay mass, usually accomplished through wedging, or far more effectively with a vacuum deairing pugmill.  Source: Clay: A Studio Handbook