The earliest ceramics made by humans were pottery objects, including 27,000-year-old figurines, made from clay, either by itself or mixed with other materials like silica, hardened, sintered, in fire. Later ceramics were glazed and fired to create smooth, colored surfaces, decreasing porosity through the use of glassy, amorphous ceramic coatings on top of the crystalline ceramic substrates.
Ash glaze - Ash glazes are ceramic glazes which were formulated from wood ash. The glaze has glasslike and pooling (built up of glaze) characteristics which put emphasis on the surface texture of the piece being glazed.
Bisc-firing - Initial kiln firing in which clay sinters without vitrifying, and though very porous, will no longer soften in water.
Bone dry - Completely dry (and very brittle) state clay must reach before firing.
Celadon - Classic East Asian transparent or translucent glaze with small percentages of iron and/or copper and/or chrome, giving range of soft greens, blue-greens, and gray-greens. Most desirable Chinese celadons often contain minute air-bubble inclusions, giving slight opalescence.
Centering - Critical step in throwing, occurring during and after wheel wedging, whereby the clay mass is formed into a symmetrical lump before penetrating and raising walls.
Kaolin - Al2O3×2SiO2×2H2O—Primary clay that fires pure white, very refractory, coarse particle size, low plasticity, high-temperature—major component of porcelain and some white ware bodies.
Chun (Jun) glaze - A pale gray-blue feldspathic stoneware glaze featuring opalescence due to inclusions of phosphorous and/or other materials.
Clay - Widely occurring aluminum silicate mineral resulting from natural decomposition of feldspar and granite. Composed of microscopic disk-shaped platelates that give clay its slippery, plastic quality.
Wedging - Process of kneading the clay with the hands to remove air bubbles and ensure homogenous mass.
Trimming - At the leather-hard stage, removal of excess clay from a piece, using any of a variety of sharp cutting tools.
Mr. Rogers is a Welsh studio potter who has been featured in a number of books on studio pottery and has worked at Lower Cefnfaes Farm's Marston Pottery since 1984 and previously in Rhayader, Powys, Wales, from 1978 to 1984. He is famous for his ash glazes and published a book about this glaze.
J.C. HERMAN Ceramics makes vases, bowls, crockery and luxury presents. All ceramics are made by hand, wheel thrown on the potter's wheel.
Mr. Lum is an Hawaiian potter: very experienced in throwing chawan bowls.
Elke Lucas has set up her ceramics studio in Noosa on the Sunshine Coast in Australia where she makes wheel thrown, high-fired porcelain. The decoration on the pots is minimal, using natural oxides, which allows the elegant shapes and the quality of the porcelain body to shine through resulting in pots that have a natural sophistication and a beautiful quiet presence.
Judith Bloedjes, visual artist, wants to give ceramics the appraisal it deserves. She designs and makes highly wearable porcelain jewellery. Her use of manifold textures and materials like porcelain and silver give these objects an industrial appearance.
Trudy started working as a Delfts blue painter at a very young age. She has her own studio and works on her own vessels. Now, her ambition is to pass on the knowledge of the art of Delfts blue painting.
Sue is a British potter working with porcelain thrown on the wheel.