Mouldmaking and Plaster of Paris
The use of moulds in ceramics is as old as ceramics itself. In fact, it seems likely that people were pressing soft clay onto hard objects even before they discovered how to fire it (baskets sealed with clay, etc.), or pressing hard objects into soft clay to make designs. When useful objects started to be made from clay, it was a logical step to use simple moulds so as to easily get the same shape every time.
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