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Encyclopedia > Ceramic glaze
Composite body, painted, and glazed bottle. Dated 16th century. From Iran. New York Metropolitan Museum of Art.

A glaze is a vitreous coating to a ceramic material whose primary purposes are decoration or protection. Glazes can be considered specialised forms of glass and therefore can be described as amorphous solids. Glazing is the process of coating the piece with a thin layer the raw materials which, on firing, will form a hard, glass-like coating. Image File history File linksMetadata Size of this preview: 280 × 598 pixel Image in higher resolution (405 × 865 pixel, file size: 300 KB, MIME type: image/jpeg) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File linksMetadata Size of this preview: 280 × 598 pixel Image in higher resolution (405 × 865 pixel, file size: 300 KB, MIME type: image/jpeg) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... An amorphous solid is a solid in which there is no long-range order of the positions of the atoms. ...


Glazing is functionally important for earthenware vessels, which would otherwise be unsuitable for holding liquids due to porosity. Glaze is also used on functional and decorative ware made of stoneware and porcelain. In addition to the functional aspect of glazes, aesthetic concerns include a variety of surface finishes, including degrees of gloss and matt, variegation and finished color. Glazes may also enhance an underlying design or texture which may be either the "natural" texture of the clay or an inscribed, carved or painted design. Earthenware is a common ceramic material, which is used extensively for pottery tableware and decorative objects. ... A Staffordshire stoneware plate from the 1850s with transferred copper print - (From the home of JL Runeberg) Stoneware is a category of clay and a type of ceramic distinguished primarily by its firing and maturation temperature (from about 1200°C to 1315 °C). ... “Fine China” redirects here. ... The Gay Head cliffs in Marthas Vineyard are made almost entirely of clay. ...


Glaze may be applied by dry dusting a dry mixture over the surface of the clay body. Liquid glazes—suspensions of various powdered minerals, and metal oxides—can be applied by dipping pieces directly into the glaze, pouring the glaze over the piece, spraying it onto the piece with an airbrush or similar tool, with a brush, or with any tool that will achieve the desired effect. A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition, a highly ordered atomic structure and specific physical properties. ... An oxide is a chemical compound containing an oxygen atom and other elements. ... Paasche F#1 Single Action External Mix Airbrush An airbrush is a small, air-operated tool that sprays various media including ink and dye, but most often paint by a process of atomization. ...


To prevent the glazed article sticking to the kiln during firing either a small part of the item is left unglazed or special refractory supports, kiln spurs, are used as supports which are removed and discarded after the firing. Small marks left by these spurs can sometimes be visible on finished ware. Charcoal Kilns, California Gold Kiln, Victoria, Australia Hop kiln. ... Kiln spurs are supports, often in the shape of a tripod, used to maintain the shape and separate pieces of pottery during the firing process. ...


Decoration applied under the glaze on pottery is generally referred to as underglaze. Underglazes are applied to the surface of the pottery, which can be either raw, "greenware", or "bisque" fired (an initial firing of some articles before the glazing and re-firing). A wet glaze—usually transparent—is applied over the decoration. The pigment fuses with the glaze, and appears to be underneath a layer of clear glaze. An example of underglaze decoration is the well-known "blue and white" porcelain famously produced in England, The Netherlands, China and Japan. The striking blue color is achieved by using the powerful colorant cobalt in the form of either cobalt oxide or cobalt carbonate, both of which are still commonly used in glaze formulation today. An underglaze is a decorative technique used in pottery. ... Blue and white wares: white pottery and porcelain wares decorated under the glaze with a blue pigment, generally cobalt oxide. ... “Fine China” redirects here. ... The surname Spode can refer to several people: Josiah Spode, a renowned English potter Roderick Spode, an amateur dictator in the stories and novels of P. G. Wodehouse This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Delftware panel. ... A colourant is something added to something else to induce a change in colour. ... Cobalt Blue is a DC Comics supervillain and an enemy to the Flash. ...

Mug with blue underglaze decoration on porcelain.

Decoration applied on top of a layer of glaze is referred to as overglaze. Overglaze methods include applying one or more layers or coats of glaze on a piece of pottery or by applying a non-glaze substance such as enamel or metals (i.e., gold leaf) over the glaze. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... This page is a candidate to be copied to Wiktionary. ... Unfired green ware pottery on a traditional drying rack at Conner Prairie living history museum. ... In a discussion of art technology, enamel (or vitreous enamel, or porcelain enamel in American English) is the colorful result of fusion of powdered glass to a substrate through the process of firing, usually between 750 and 850 degrees Celsius. ... It has been suggested that this article or section be merged with Metal leaf. ...


Overglaze colors are low-temperature glazes that give ceramics a more decorative, glassy look. A piece is fired first, overglaze is applied, and it is fired again. Once the piece is fired and comes out of the kiln, its texture becomes smoother because of the glaze.


History

Earliest vessels date back to 10,000 BC. Vessels with a pointed shape and incised rope patterns, similar to Siberian vessels of the period, were made by people from northern Japan. These vessels were unglazed.


During the Kofun period of Japan, high-fired, hard-bodied sue ware was decorated with greenish natural ash glazes. From 552 AD to 794 AD, differently colored glazes were introduced. The three colored glazes of the Tang Dynasty were frequently used for a period, but were gradually phased out; the precise colors and compositions of the glazes have not been recovered. Natural ash glaze, however, was commonly used throughout the country. The following text needs to be harmonized with text in the article History of Japan#Yamato period. ... Sue ware (literally offering ware) was a blue-gray form of high-fired pottery which was produced in Japan and Korea during the Kofun, Nara, and Heian periods. ... China under the Tang Dynasty (yellow) and its sphere of influence Capital Changan (618–904) Luoyang (904-907) Language(s) Chinese Religion Buddhism, Taoism, Confucianism Government Monarchy Emperor  - 618-626 Emperor Gaozu  - 684, 705-710 Emperor Zhongzong  - 684, 710-712 Emperor Ruizong  - 904-907 Emperor Ai History  - Li Yuan...


In the thirteenth century, flower designs were painted with red, blue, green, yellow, and black overglazes. Overglazes became very popular because of the polished look they gave ceramics. Ceramics can refer to: Ceramic, a type of material Ceramics (art), a fine art. ...


See also

Unfired green ware pottery on a traditional drying rack at Conner Prairie living history museum. ... “Fine China” redirects here. ... Swatow ware or Swatow is a common name for a group of mainly late Ming export porcelain from China intended for the South East Asian market. ... Ash Glaze is a high temperature glaze for stoneware pottery that includes the ashes of trees, shrubs, plants or grasses within the glaze recipe. ... For Pb as an abbreviation, see PB. General Name, Symbol, Number lead, Pb, 82 Chemical series Post-transition metals or poor metals Group, Period, Block 14, 6, p Appearance bluish gray Standard atomic weight 207. ... Shino is a generic term for a family of pottery glazes. ... Alternate meaning: Celadon (color) Celadon funerary jar from the Three Kingdoms period Celadon is a type of pottery having a pale green glaze. ...

Reference

  • Hamer, Frank and Janet. The Potter's Dictionary of Materials and Techniques. A & C Black Publishers, Limited, London, England, Third Edition 1991. ISBN 0-8122-3112-0.

 
 

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