1745

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1. Ceramics
The first recorded use of plaster of paris molds was in Staffordshire, England, about 1745. Plaster molds enabled pieces to be cast in slip (liquid clay); when slip was poured into the mold, the plaster absorbed the water from it, leaving a layer of clay on the inner surface of the mold, the remainder of the slip was then poured off, and the casting (greenware) could be removed.
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