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Tagged:  flux


Soda, Clay and Fire

Posted On March 22, 2014 Comments Off on Soda, Clay and Fire

For anyone interested in soda or salt firing, Soda, Clay and Fire covers the topic in great detail. The technical research and presentation surpass all existing literature on the topic, and the rich, vibrant examples of finished work are stunning and sure to inspire. With soda firing, the creative process continues until the kiln is turned off. Nichols’ book discusses the principles behind this technique and delves into clays, glazes, loading protocols, firing schedules and more. Also included are profiles of other artists working with this technique and examples of their work.


How Glazes Melt: In Search of the Elusive Eutectic

Posted On December 9, 2009 2 Comments

Phases are specific forms of materials. The most familiar phases are solid, liquid and vapor. Any phase of a material is identical in composition and structure in all parts of that phase. For instance, a glass of water is the liquid phase of H2O, top to bottom; if it weren’t, we’d call it something else, like ice if it were solid (structural change), or lemonade if it had lemon and sugar dissolved in it (compositional change).


Leaving Bariumville: Replacing Barium Carbonate in Cone 10 Glazes

Posted On November 17, 2009 5 Comments

Barium carbonate has long been used as an ingredient in high-fire glazes, sometimes conferring unique properties upon glazes. One of the alkaline earth carbonates, it has also been used as rat poison (large doses can be toxic to humans as well). Glazes containing it ought to be checked for barium leaching if they are intended to hold food or drink, or reserved for surfaces that do not come into contact with food. It is not my intent to present the research on barium toxicity here, but to present a course of action for replacing it in glazes.

zinc oxide

Posted On December 18, 2008 0 Comments
ZnO—High-temperature flux that promotes brilliant glossy surfaces. In some glazes can encourage opacity. With titanium in low-alumina glaze can encourage macrocrystalline growth (crystalline glazes). Volatizes in high-fire reduction. Toxic in inhalation. Source: Clay: A Studio Handbook

whiting; calcium carbonate; limestone; marble; chalk

Posted On December 18, 2008 0 Comments
CaCO3—alkaline earth, contributing calcium oxide to glaze—powerful all-temperature flux—major high-temperature flux for glazes—gives strong durable glass. Sometimes used in low-fire claybodies to extend firing range and give greater fired strength. Source: Clay: A Studio Handbook

talc; magnesium silicate; steatite; soapstone

Posted On December 16, 2008 0 Comments
3MgO×4SiO2×H2O High-temperature alkaline earth flux in glaze, promotes smooth buttery surfaces, partial opacity. 

strontium carbonate

Posted On December 16, 2008 0 Comments
SrCO3 Alkaline earth, high-temperature flux, similar to barium, slightly more powerful. 


Posted On December 16, 2008 0 Comments
Li2O×Al2O3×4SiO2—lithium feldspar—powerful high-temperature alkaline flux. Promotes copper blues—good for thermal-shock bodies and matching glaze. Toxic in inhalation. 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

barium carbonate

Posted On November 21, 2008 0 Comments
BaCO3—alkaline earth—active high-temperature flux, but also promotes matt glaze surface. Unsafe for low-fire functional glazes. Source: Clay: A Studio Handbook