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After being written on, clay tablets could be reworked into fresh tablets and reused if needed, or fired to make them permanent records. Nowadays, clay is added as a filler to graphite, in pencil lead, to change the hardness and blackness of the pencil. Purpose-made clay balls were used as sling ammunition. [27]
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.
Paper clay produced by pottery clay manufacturers is a clay body to which a small percentage of processed cellulose fiber has been added. When kiln-fired, the paper burns out, leaving the clay body. Consequently, the firing temperatures and glazes selection should be the same on those used with the clay body.
An inorganic, crystalline non-metallic solid formulated from metal or non-metal compounds whose irreversible formation occurred during heating to high temperatures. Chamotte A ceramic material formed by the high temperature firing of a refractory clay, after which it is crushed (and sometimes then milled) before being graded to size.
Origami-like silver objects made from metal clay with silver powder. Metal clay is a crafting medium consisting of very small particles of metal such as silver, gold, bronze, or copper mixed with an organic binder and water for use in making jewelry, beads and small sculptures. Originating in Japan in 1990, metal clay can be shaped just like ...
World War II pillbox on eroding boulder clay, Filey Bay, England Boulder clay cliffs in Gwynedd with Dinas Dinlle in the background. Boulder clay is an unsorted agglomeration of clastic sediment that is unstratified and structureless and contains gravel of various sizes, shapes, and compositions distributed at random in a fine-grained matrix.
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A ball clay mine in the UK. They are relatively scarce deposits due to the combination of geological factors needed for their formation and preservation. [6] Commercial extraction of ball clays is undertaken across the world, including: [7]