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use of hydraulic mortar after the Roman period until the 18th century.

Plaster decoration was widely used in Europe in the Middle Ages where, from the mid-13th century, gypsum plaster was used for internal and external plaster. Hair was employed as reinforcement, with additives to assist set or plasticity including malt, urine, beer, milk and eggs.

14th century

In the 14th century, decorative plasterwork called pargeting

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