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Composite body, painted, and glazed bottle. Iran, 16th century (Metropolitan Museum of Art) Detail of dripping rice-straw ash glaze (top), Japan, 1852. Ceramic glaze, or simply glaze, is a glassy coating on ceramics. It is used for decoration, to ensure the item is impermeable to liquids and to minimize the adherence of pollutants. [1]
Repaired ceramic bowl from the National Museum of Vietnam History. A chemical compound that adheres or bonds items together, such as pieces of ceramic. In ceramic conservation there are several different types that range from natural to man-made adhesives. Conservators characterise the best adhesive as one which can be undone.
Underglaze is a method of decorating pottery in which painted decoration is applied to the surface before it is covered with a transparent ceramic glaze and fired in a kiln. Because the glaze subsequently covers it, such decoration is completely durable, and it also allows the production of pottery with a surface that has a uniform sheen.
Yūri-kinsai (釉裏金彩) is a gold leaf-application technique used in Japanese pottery and porcelain. It forms a transparent overglaze on gilded porcelain. [1] Yūri-kinsai is a complicated under look technique. It uses two kinds of gold leaf that consists of one thick and one thin layer.
The wares were glazed with a lead-alkaline-tin glaze, whose composition has been found from analysis to be lead oxide 25-30 percent, silica 45–55 percent, sodium oxide 8–14 percent and tin oxide 4–7 percent. [39] Tin oxide is often employed to render glaze opaque but in İznik glazes, it remains in solution and is transparent. [40]
Fabric colours generally range from brick red to reddish-yellow. Finishes range from thin and uneven to thick and glossy. A clear lead glaze was often used, giving the pottery products an orange or reddish-brown colour. Other glaze colours include olive, brown and green. Green glaze was created by potters by adding copper to lead glaze. [6]