March 28, 2008, Newsletter Issue #286: White earthenware
Tip of the Week
Bright candy colors, lightness, low-fire, These are a few things that describe white earthenware clay. Cast items are most often made from this type of clay. When an earthenware piece is struck with an object it often makes a “clanky” ring, while stoneware and porcelains are more likely to make a bell-like chime. Earthenware clays normally rely on talc (magnesia) as an active flux (melter), and ball clay as a source of silica, alumina and plasticity. The end result is a clay mixture that fires bright white between cone 06 and cone 2. Above cone 2, many earthenware bodies will begin to melt and slump and liquefy above cone 6!
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