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Tagged:  testing




ternary-diagram

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).

Latex resist was painted on the lip and underside of this porcelain vessel and 10% potassium dichromate was painted on the entire bowl. The latex was then removed and the following WSMS solutions were dotted and brushed on: 15% cobalt chloride, 50% cobalt chloride, 25% iron chloride, 50% nickel chloride and an "all gray" solution (10 grams each of potassium permangantate, cobalt chloride, molybdic acid and iron chloride in 100cc water).

Salts of the Earth

Posted On November 17, 2009 9 Comments

Beautiful, soft, muted-color brushstrokes and washes of water-soluble metal salts decorate Gary Holt’s translucent porcelain bowls and plates. The simplicity and quiet presence of his works belie the years that Holt spent experimenting and perfecting his technique. Using water-soluble metals salts (WSMS) demands excellent technical skills and careful attention to details.

gloss-blue-glaze by Jeff Zamek

Glazes: Materials, Mixing, Testing, Firing

Posted On November 5, 2009 4 Comments

How many times have you copied a glaze formula, only to find that it didn’t work as expected? It is not unheard of for glazes with the same formula to produce different results. While this may seem like a dead end, it does not have to be.