Method
Plaster is applied to the original to create a mould or cast (that is, a negative impression) of the original). This mould is then removed and fresh plaster is poured into it, creating a copy in plaster of the original. Usually very elaborate moulds were made out of several to even dozens of pieces, to cast the more difficult undercut sculptures. Plaster is not flexible, therefore the moulds were made as 3D jigsaw puzzles for easy removal of the original and the cast from the mould. Later gelatine, rubber and silicone moulds were used, backed by plaster or polyester for support.
Read more about this topic: Plaster Cast
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—Sir Arthur Conan Doyle (1859–1930)
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—Catherine E. Beecher (1800–1878)