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
Calcine
To heat a material to a temperature high enough to drive off all chemically combined water.
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
Bourry Box
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.
Completely dry (and very brittle) state clay must reach before firing.
Source:
Clay: A Studio Handbook
Bone China
Translucent porcelain containing bone ash.
Source:
Clay: A Studio Handbook
Bone Ash Calcium Phosphate
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
Body Reduction
Period of reduction atmosphere induced between cone 012 and 08 to bring out iron color and speckles in clay body, especially in high-fired stoneware.
Source:
Clay: A Studio Handbook
Blunger
A motorized impeller-mixer used in preparing casting slip.
Source:
Clay: A Studio Handbook
Blunge
The process of mixing a glaze or slip with a motorized impeller-mixer.
Source:
Clay: A Studio Handbook
Bloating
Firing defect where blisters form within clay body, raising large lumps on the surface.
In glaze chemistry, the fluxes or melting agents that are combined with acids (glass-formers) and neutrals (refractories).
Source:
Clay: A Studio Handbook
Barnard Clay
Slip clay with very high iron content, often used as brown colorant for clay bodies.
Source:
Clay: A Studio Handbook
Ball Mill
A mechanically revolving vessel in which ceramic materials can be placed along with water and flint pebbles or high-fired porcelain slugs. Used to grind clay and glaze materials.
Source:
Clay: A Studio Handbook
Ball Clay
Al2O3×2SiO2×2H2O —Secondary clays deposited in marshy areas. Very fine particle size, high plasticity, high in organic contaminates, and fires white or off-white. Used as the primary plasticizing clay in most clay bodies, but in large quantities promotes high shrinkage.
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
To heat a material to a temperature high enough to drive off all chemically combined water.
Check out this article on calcining kaolin from the Ceramics Monthly archives!
Source: Clay: A Studio Handbook
Iron-manganese ore—good color source for basalt bodies.
Source: Clay: A Studio Handbook
Method of achieving a shine by rubbing clay or slip with smooth hard object.
Here's a wonderful article on burnishing clay!
Source: Clay: A Studio Handbook
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.
Read this great article on a community Bourry box kiln build!
Source: Clay: A Studio Handbook
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 clay body, especially in high-fired stoneware.
Source: Clay: A Studio Handbook
A motorized impeller-mixer used in preparing casting slip.
Source: Clay: A Studio Handbook
The process of mixing a glaze or slip with a motorized impeller-mixer.
Source: Clay: A Studio Handbook
Firing defect where blisters form within clay body, raising large lumps on the surface.
Get in-depth information on bloating in this article!
Source: Clay: A Studio Handbook
Glaze defect where fired glaze surface contains bubbles, which often break open to leave sharp-edged craters in surface.
Find more information in this helpful article!
Source: Clay: A Studio Handbook
Initial kiln firing in which clay sinters without vitrifying, and though very porous, will no longer soften in water.
Learn more about bisque firing in this post!
Source: Clay: A Studio Handbook
Al2O3×5SiO2×7H2O —Montmorillonitic clay formed from decomposition of airborne volcanic ash.
Taker a deeper dive into bentonite in this article!
Source: Clay: A Studio Handbook
In glaze chemistry, the fluxes or melting agents that are combined with acids (glass-formers) and neutrals (refractories).
Source: Clay: A Studio Handbook
Slip clay with very high iron content, often used as brown colorant for clay bodies.
Source: Clay: A Studio Handbook
A mechanically revolving vessel in which ceramic materials can be placed along with water and flint pebbles or high-fired porcelain slugs. Used to grind clay and glaze materials.
Source: Clay: A Studio Handbook
Al2O3×2SiO2×2H2O —Secondary clays deposited in marshy areas. Very fine particle size, high plasticity, high in organic contaminates, and fires white or off-white. Used as the primary plasticizing clay in most clay bodies, but in large quantities promotes high shrinkage.
Learn more about ball clays in this helpful post!
Source: Clay: A Studio Handbook