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The most common ceramics that need consolidation are excavated pieces because they tend to have lost their bonding fabrics due to leaching or absorption of soluble salts. A consolidant works in two ways: it either links to the particles in the ceramic chemically or it may form a support system mechanically without reacting with the fabric itself.
These variations affect the color of the clay before and after firing. Iron is the most common material found in clay, and can add red, grey, or buff coloring to the object. [ 5 ] Pottery can be coarse wares, which are undecorated or only minimally decorated utilitarian vessels, or fine wares, which are decorated, finely potted, and used for a ...
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 minimise the adherence of pollutants. It is used for decoration, to ensure the item is impermeable to liquids and to minimise the adherence of pollutants.
China painting, or porcelain painting, [a] is the decoration of glazed porcelain objects, such as plates, bowls, vases or statues. The body of the object may be hard-paste porcelain, developed in China in the 7th or 8th century, or soft-paste porcelain (often bone china), developed in 18th-century Europe.
Vitreous enamel, also called porcelain enamel, is a material made by fusing powdered glass to a substrate by firing, usually between 750 and 850 °C (1,380 and 1,560 °F). The powder melts, flows, and then hardens to a smooth, durable vitreous coating.
Craquelure affecting the glaze in ceramics may develop with age but has also been used as a deliberate decorative effect, which has a long history in Korean and Chinese pottery in particular. [9] These deliberate glazing effects are usually known as "crackle", with crackle[d] glaze or "crackle porcelain" being common terms.
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Sodium from the salt reacts with silica in the clay body to form a glassy coating of sodium silicate. The glaze may be colourless or may be coloured various shades of brown (from iron oxide), blue (from cobalt oxide), or purple (from manganese oxide). [1] [2] [3] Except for its use by a few studio potters, the process is obsolete. Before its ...