In glazes, phenomenon where a glaze gives different colors in thick and thin areas—the color breaks from thick to thin. Effect accentuated in reduction firing when glazes reoxidize to different color in thinner areas, as in Temmoku breaking from black to brown, or copper red from red to clear. Source: Clay: A Studio Handbook
Type of wood-kiln firebox where primary air enters at top of firebox, passes down through wood, and combustion occurs at level of grates or hobs, and is supercharged by the heat of the coal bed.
Na2O×2B2O3×10H2O—a major LT alkaline flux, available in granular or powdered form.
Earliest and most basic firing process, where wares are fired in an open bonfire.
Completely dry (and very brittle) state clay must reach before firing. Source: Clay: A Studio Handbook
Translucent porcelain containing bone ash. Source: Clay: A Studio Handbook
Ca3(PO4)2—HT flux—opacifier in LT glazes—translucence in HT glazes (from colloidal phosphorus globules) and especially in bone china (from supercharged glassy-phase). Toxic in inhalation. Source: Clay: A Studio Handbook
Period of reduction atmosphere induced between cone 012 and 08 to bring out iron color and speckles in claybody, especially in high-fired stoneware. Source: Clay: A Studio Handbook
A motorized impeller-mixer used in preparing casting slip.
The process of mixing a glaze or slip with a motorized impeller-mixer. Source: Clay: A Studio Handbook