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Blue Mountain Pottery were known for their combinations of glazes that gave each item a unique finish. The initial glaze used was a deep blue-green, combined with a darker glaze. This combination of glazes, called a "flow glaze" or a "drip glaze" process, meant that during the firing process, each piece obtained a unique appearance. [1] [3]
Heavy metals are dense metals used in glazes to produce a particular color or texture. [11] Glaze components are more likely to be leached into the environment when non-recycled ceramic products are exposed to warm or acidic water. [14] Leaching of heavy metals occurs when ceramic products are glazed incorrectly or damaged. [14]
Tang dynasty tomb figure, sancai horse, 7–8th century, also using blue, as on the saddle. Sancai (Chinese: 三 彩; pinyin: sāncǎi; lit. 'three colours') [1] is a versatile type of decoration on Chinese pottery and other painted pieces using glazes or slip, predominantly in the three colours of brown (or amber), green, and a creamy off-white.
The glaze has glasslike and pooling (buildup of glaze) characteristics which puts emphasis on the surface texture of the piece being glazed. When the glaze is mostly made up of wood ash, the final result is mostly dark brown to green. The pots with these glazes resemble the earth in color and texture.
Glazes can change the chroma, value, hue and texture of a surface. Glazes consist of a great amount of binding medium in relation to a very small amount of pigment. [1] Drying time will depend on the amount and type of paint medium used in the glaze. The medium, base, or vehicle is the mixture to which the dry pigment is added.
Desired blue and green finishes were achieved with the use of copper oxide on their glazing process. Ptolemaic faience has a self-glazing process. In addition to not using successive layers of glaze after the underglaze, Ptolemaic faience also applied a lower kiln temperature.
1883 reconstruction of color scheme of the entablature on a Doric temple Polychrome is the "practice of decorating architectural elements, sculpture, etc., in a variety of colors." [ 1 ] The term is used to refer to certain styles of architecture , pottery , or sculpture in multiple colors.
Blue glazes were first developed by ancient Mesopotamians to imitate lapis lazuli, which was a highly prized stone. Later, a cobalt blue glaze became popular in Islamic pottery during the Abbasid Caliphate, during which time the cobalt was mined near Kashan , Oman , and Northern Hejaz .