Information AboutGlaze |
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Glaze also means to install glass windows. COOKING TECHNIQUE Glaze in Cooking is a coating of a glossy, often sweet, mixture applied to food. Egg whites and Icing are both used as glazes. For example, Donut glaze is easily made from a simple mixture of Confectioner's Sugar and water. PAINTING TECHNIQUE Glaze in Painting is a transparent medium. Whatever is on the surface beneath the glaze shows through applied medium. A glaze changes the color cast or texture (gloss or matte, for instance) of the surface. For many centuries painters have applied glazes to their works. When the technique is used for wall Glazing , the entire surface is covered, often showing traces of texture (French brush, parchment, striae, rag rolling). Either oil-based or water-based materials are used for glazing walls, depending upon the desired effect. Kerosene or linseed oil may be used to extend the "open" or working time of oil-based glazes. Water-based glazes are sometimes thinned with glycerin or another wetting agent to extend the working time. In general, water glazes are best suited to rougher textures where overlaps of color are acceptable. Scumble is a technique similar to glazing, except that coating is opaque. CERAMIC GLAZES 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. In Pottery , ''glazing'' is the process of coating the piece with a thin layer of glassy material, called a glaze. After application, the pottery is fired, and the powdered coating melts into a hard, glass-like coating. 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 smooth pleasing surface, the degree of gloss and 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. Glaze may be applied by dry dusting a dry mixture over the surface of the clay. Liquid glazes - suspensions of various powdered Clays , Minerals , and metal Oxides - can applied by dipping pieces directly into the glaze, pouring the glaze over the piece, sprayed onto the piece with an Airbrush or similar tool, with a brush, or with any tool that will achieve the desired effect. With all glazed items, a small part of the item (usually on the base of the piece) must be left unglazed, or the piece will be effectively "glued" to the Kiln shelf during firing. To prevent glazed and stacked pieces from sticking together, Kiln Spurs were invented. Early pottery, such as European faïences until the early 18th century, often has clearly visible marks from such spurs. 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 in either raw ("greenware") or "bisque" fired (a low temperature firing which removes all water from the clay, and partially vitrifies the clay particles leaving it somewhat porous). A wet glaze - usually transparent - is applied over the decoration. The pigment fuses with the glaze, and appears to be under a layer of clear glaze. An example of underglaze decoration is the well known " Blue And White " Porcelain produced in China and Japan . The striking blue colour 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. 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 (ie., Gold Leaf ) over the glaze. SEE ALSO REFERENCE
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