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A material used in all types of glazes to produce typical magnesium effects i.e. in large quantities, opacity and vellum texture.
Having low expansion and contraction it can cure crazing.
Talc is also used to introduce magnesium and silica into bodies, particularly those fired at low temperatures.
However, it reduces plasticity, and is more suitable for castware, tiles and where whiteness is important. Low expansion makes it an appropriate ingredient of flameproof bodies.