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Grog, temper for clay. Grog, also known as firesand and chamotte, is a raw material usually made from crushed and ground potsherds, reintroduced into crude clay to temper it before making ceramic ware. It has a high percentage of silica and alumina. It is normally available as a powder or chippings, and is an important ingredient in Coade stone.
Moche portrait vessel, Musée du quai Branly, ca. 100—700 CE, 16 x 29 x 22 cm Jane Osti (Cherokee Nation), with her award-winning pottery, 2006. Ceramics of Indigenous peoples of the Americas is an art form with at least a 7500-year history in the Americas. [1] Pottery is fired ceramics with clay as a component.
Clay tempered with sand, grit, crushed shell or crushed pottery were often used to make bonfire-fired ceramics because they provided an open-body texture that allowed water and volatile components of the clay to escape freely. The coarser particles in the clay also acted to restrain shrinkage during drying, and hence reduce the risk of cracking.
' kneading ') is a Japanese pottery term describing the artistic technique where multiple colors of clay are marbled or combined to create various designs. [1] The technique can also be called neriage (練上げ), [2] although this more commonly refers to throwing multiple colors of clay on a wheel. [3]
Ball clays are kaolinitic sedimentary clays that commonly consist of 20–80% kaolinite, 10–25% mica and 6–65% quartz, along with small amounts of organic matter (such as lignite) and trace amounts of other minerals such as pyrite and siderite.
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Classic potter's kick-wheel in Erfurt, Germany An electric potter's wheel, with bat (green disk) and throwing bucket. Not shown is a foot pedal used to control the speed of the wheel, similar to a sewing machine. In pottery, a potter's wheel is a machine used in the shaping (known as throwing) of clay into round ceramic ware.
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