Overglaze in the context of "Doucai"

Lead-glazed earthenware is one of the traditional types of earthenware with a ceramic glaze, which coats the ceramic bisque body and renders it impervious to liquids, as terracotta itself is not. Plain lead glaze is shiny and transparent after firing. Coloured lead glazes are shiny and either translucent or opaque after firing. Three other traditional techniques are tin-glazed (in fact this is lead glaze with a small amount of tin added), which coats the ware with an opaque white glaze suited for overglaze brush-painted colored enamel designs; salt glaze pottery, also often stoneware; and the feldspathic glazes of Asian porcelain. Modern materials technology has invented new glazes that do not fall into these traditional categories.

In lead glazes, tints provided by impurities render greenish to brownish casts, with aesthetic possibilities that are not easily controlled in the kiln. The Romans used lead glazes for high-quality oil lamps and drinking cups. At the same time in China, green-glazed pottery dating back to the Han period (25–220 AD) gave rise eventually to the sancai ('three-color') Tang dynasty ceramics, where the white clay body was coated with coloured glazes and fired at a temperature of 800 degrees C. Lead oxide was the principal flux in the glaze. Polychrome effects (i.e. the colours) were obtained by using the oxides of copper (which turns green), iron (brownish yellow), and less often manganese (brown) and cobalt (blue).

Enamelled glass or painted glass is glass which has been decorated with vitreous enamel (powdered glass, usually mixed with a binder) and then fired to fuse the glasses. It can produce brilliant and long-lasting colours, and be translucent or opaque. Unlike most methods of decorating glass, it allows painting using several colours, and along with glass engraving, has historically been the main technique used to create the full range of image types on glass.

All proper uses of the term "enamel" refer to glass made into some flexible form, put into place on an object in another material, and then melted by heat to fuse them with the object. It is called vitreous enamel or just "enamel" when used on metal surfaces, and "enamelled" overglaze decoration when on pottery, especially on porcelain. Here the supporting surface is glass. All three versions of the technique have been used to make brush-painted images, which on glass and pottery are the normal use of the technique.

Tin-glazing is the process of giving tin-glazed pottery items a ceramic glaze that is white, glossy and opaque, which is normally applied to red or buff earthenware. Tin-glaze is plain lead glaze with a small amount of tin oxide added. The opacity and whiteness of tin glaze encourage its frequent decoration. Historically this has mostly been done before the single firing, when the colours blend into the glaze, but since the 17th century also using overglaze enamels, with a light second firing, allowing a wider range of colours. Majolica, maiolica, delftware and faience are among the terms used for common types of tin-glazed pottery.

An alternative is lead-glazing, where the basic glaze is transparent; some types of pottery use both. However, when pieces are glazed only with lead, the glaze becomes fluid during firing, and may run or pool. Colours painted on the glaze may also run or blur. Tin-glazing avoids these problems.

Imari ware (Japanese: 伊万里焼, Hepburn: Imari-yaki) is a Western term for a brightly-coloured style of Arita ware (有田焼, Arita-yaki) Japanese export porcelain made in the area of Arita, in the former Hizen Province, northwestern Kyūshū. They were exported to Europe in large quantities, especially between the second half of the 17th century and the first half of the 18th century.

Typically Imari ware (in the English use of the term) is decorated in underglaze blue, with red, gold, black for outlines, and sometimes other colours, added in overglaze. In the most characteristic floral designs most of the surface is coloured, with "a tendency to overdecoration that leads to fussiness". The style was so successful that Chinese and European producers began to copy it. Sometimes the different overglaze styles of Kakiemon and Kutani ware are also grouped under Imari ware.

Hispano-Moresque ware is a style of initially Islamic pottery created in Al-Andalus (Muslim Iberia), which continued to be produced under Christian rule in styles blending Islamic and European elements. It was the most elaborate and luxurious pottery being produced in Europe until the Italian maiolica industry developed sophisticated styles in the 15th century, and was exported over most of Europe. The industry's most successful period was the 14th and 15th centuries.

Around 711, the Moors conquered part of Spain. Over the following centuries, they introduced two ceramic techniques to Europe: glazing with an opaque white tin-glaze, and lustreware, which imitates metallic finishes with iridescent effects. Hispano-Moresque wares use both processes, applying the paint as an overglaze which is then fired again. Lustreware was a speciality of Islamic pottery, at least partly because the use of drinking and eating vessels in gold and silver, the ideal in ancient Rome and Persia as well as medieval Christian societies, is prohibited by the Hadiths, with the result that pottery and glass were used for tableware by Muslim elites, when Christian medieval elites still normally used metal for both dishes and cups.

Nabeshima ware (鍋島焼, Nabeshima-yaki) is a type of Japanese pottery, specifically an unusually high-quality porcelain. It was produced in Ōkawachi kilns managed directly by the Saga Domain under the Nabeshima clan from the 17th to the 19th centuries. Imari ware and Arita ware were also under the control of the Saga Domain, and Nabeshima ware is sometimes regarded as a variant of Imari ware, as its kilns were located in what is now the city of Imari, Saga Prefecture Japan. The technique also differs from that of most Japanese porcelain, with the outlines of the pattern done in underglaze blue before the overglaze "enamelled" final decoration. Nabeshima ware was not made for sale, but for the specific use of the Nabeshima clan and as gifts for the Tokugawa shogunate and various daimyō. It was discontinued in 1871 with the abolition of the feudal domains, but the technique was revived as a modern craft by the Imaizumi Imaemon family, descendants of the master lineage, and has continued to the 21st century.

Arita ware (Japanese: 有田焼, Hepburn: Arita-yaki) is a broad term for Japanese porcelain made in the area around the town of Arita, in the former Hizen Province, northwestern Kyūshū island. It is also known as Hizen ware (肥前焼, Hizen-yaki) after the wider area of the province. This was the area where the great majority of early Japanese porcelain, especially Japanese export porcelain, was made.

In English usage "Arita ware" was traditionally used for the export wares in blue and white porcelain, mostly copying Chinese styles. The wares with added overglaze colours were called Imari ware or (a sub-group) Kakiemon. It is now recognized that the same kilns often made more than one of these types, and "Arita ware" is more often used as a term for all of them. The brightly coloured Kutani ware is another type that is now recognised as coming from around Arita as well as the Kutani itself, and "Kutani-type" is used as a stylistic description.