Greek term meaning earthenware from which the word ceramics is derived.
Source:
Clay: A Studio Handbook
Kaolinite
Crystalline clay mineral forming the basis of most clays we use in ceramics.
Source:
Clay: A Studio Handbook
Kanna
Japanese trimming tool, formed of a steel strap bent and sharpened on the ends.
Source:
Clay: A Studio Handbook
Kaki
High-fired Japanese saturated iron glaze usually containing at least 10% (of dry-batch weight) iron oxide, which produces iridescent microcrystalline rust red.
Source:
Clay: A Studio Handbook
Iron Oxide Black Ferrous
FeO—reduced form of iron oxide—gives same results as red iron in the firing, dependent on oxidation/reduction.
Source:
Clay: A Studio Handbook
Iron Chromate
FeO×Cr2O3—glaze colorant producing pink or red with tin, brown with zinc, gray with alkaline fluxes. Highly toxic in absorption, inhalation, and ingestion.
Source:
Clay: A Studio Handbook
Iron
Most abundant coloring material on earth, responsible for brown and sometimes black color in natural rock and fired clays. In oxidation firings, the red ferric oxide remains very refractory, but in reduction firing and or at high-fire temperatures it transforms to the black ferrous oxide, a powerful flux.
Source:
Clay: A Studio Handbook
Interface
Contact face between clay and glaze. On low-fired wares, primarily just a physical interlocking of glaze into pores in clay. In high-fired wares, an intimate interaction of clay and glaze, reinforced by mullite crystals, creating very strong bond.
Source:
Clay: A Studio Handbook
Inclusions
Any particles or bubbles of material that remain suspended within the glaze-melt, affecting the glaze appearance.
Source:
Clay: A Studio Handbook
Incising
Decorating technique where design is formed by cutting or carving shallow lines in clay surface.
Source:
Clay: A Studio Handbook
Impressing
Decorating technique where textured or patterned material or object is pressed into clay surface.
Source:
Clay: A Studio Handbook
Ilmenite
An iron ore with significant titanium—most often used in granular form to produce dark specks in clay or glaze. Higher iron concentration than in rutile.
Source:
Clay: A Studio Handbook
Hydrometer
Laboratory device for measuring specific gravity in slips and glazes. Does not give absolute measurement, and should be used only for comparing and reproducing results. Must be an appropriate glaze hydrometer for measuring suspensions heavier than water. Does not work well in thick glazes.
Source:
Clay: A Studio Handbook
Hydrocarbons
Combustible gases containing hydrogen and carbon, present in fuel gases and produced when carbon-based liquid or solid fuels are heated above kindling temperature.
Source:
Clay: A Studio Handbook
Hot Face
The interior refractory surface of a kiln.
Source:
Clay: A Studio Handbook
Hobs
Steps constructed in walls of wood-kiln firebox in place of grates. Wood cut to proper length catches on hobs and remains suspended above coal bed, insuring quick and complete combustion.
Source:
Clay: A Studio Handbook
Hispano Moresque
Decorative style originating in Moorish Spain, characterized by extremely elaborate patterning and curvilinear plant motifs; major influence on Italian maiolica.
Source:
Clay: A Studio Handbook
High Fire
High-temperature firing range usually including cone 8 to cone 12, for firing stoneware or porcelain.
Source:
Clay: A Studio Handbook
HEPA (High Efficiency Particulate Arrestor)
Industrial designation that indicates that a filter or dust mask is capable of blocking microscopic particulates such as silica dust.
Source:
Clay: A Studio Handbook
Helmer Kaolin
Al2O3×2SiO2×2H2O—Kaolin that works especially well as flashing slip for salt, soda, and wood firing, especially since Avery kaolin is no longer being mined.
Greek term meaning earthenware from which the word ceramics is derived.
Source: Clay: A Studio Handbook
Crystalline clay mineral forming the basis of most clays we use in ceramics.
Source: Clay: A Studio Handbook
Japanese trimming tool, formed of a steel strap bent and sharpened on the ends.
Source: Clay: A Studio Handbook
High-fired Japanese saturated iron glaze usually containing at least 10% (of dry-batch weight) iron oxide, which produces iridescent microcrystalline rust red.
Source: Clay: A Studio Handbook
FeO—reduced form of iron oxide—gives same results as red iron in the firing, dependent on oxidation/reduction.
Source: Clay: A Studio Handbook
FeO×Cr2O3—glaze colorant producing pink or red with tin, brown with zinc, gray with alkaline fluxes. Highly toxic in absorption, inhalation, and ingestion.
Source: Clay: A Studio Handbook
Most abundant coloring material on earth, responsible for brown and sometimes black color in natural rock and fired clays. In oxidation firings, the red ferric oxide remains very refractory, but in reduction firing and or at high-fire temperatures it transforms to the black ferrous oxide, a powerful flux.
Source: Clay: A Studio Handbook
Contact face between clay and glaze. On low-fired wares, primarily just a physical interlocking of glaze into pores in clay. In high-fired wares, an intimate interaction of clay and glaze, reinforced by mullite crystals, creating very strong bond.
Source: Clay: A Studio Handbook
Any particles or bubbles of material that remain suspended within the glaze-melt, affecting the glaze appearance.
Source: Clay: A Studio Handbook
Decorating technique where design is formed by cutting or carving shallow lines in clay surface.
Source: Clay: A Studio Handbook
Decorating technique where textured or patterned material or object is pressed into clay surface.
Source: Clay: A Studio Handbook
An iron ore with significant titanium—most often used in granular form to produce dark specks in clay or glaze. Higher iron concentration than in rutile.
Source: Clay: A Studio Handbook
Laboratory device for measuring specific gravity in slips and glazes. Does not give absolute measurement, and should be used only for comparing and reproducing results. Must be an appropriate glaze hydrometer for measuring suspensions heavier than water. Does not work well in thick glazes.
Source: Clay: A Studio Handbook
Combustible gases containing hydrogen and carbon, present in fuel gases and produced when carbon-based liquid or solid fuels are heated above kindling temperature.
Source: Clay: A Studio Handbook
The interior refractory surface of a kiln.
Source: Clay: A Studio Handbook
Steps constructed in walls of wood-kiln firebox in place of grates. Wood cut to proper length catches on hobs and remains suspended above coal bed, insuring quick and complete combustion.
Source: Clay: A Studio Handbook
Decorative style originating in Moorish Spain, characterized by extremely elaborate patterning and curvilinear plant motifs; major influence on Italian maiolica.
Source: Clay: A Studio Handbook
High-temperature firing range usually including cone 8 to cone 12, for firing stoneware or porcelain.
Source: Clay: A Studio Handbook
Source: Clay: A Studio Handbook
Al2O3×2SiO2×2H2O—Kaolin that works especially well as flashing slip for salt, soda, and wood firing, especially since Avery kaolin is no longer being mined.
Source: Clay: A Studio Handbook