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  1. Sep 23, 2023 · Because the resulting liquid was thin and had an unnatural, bluish tint, vendors stirred in additives such as chalk, flour, eggs, and Plaster-of-Paris to achieve a (slightly) more agreeable...

  2. plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.

    • The Editors of Encyclopaedia Britannica
  3. Feb 18, 2024 · Plaster of Paris has its origins in the Paris Basin, where large deposits of gypsum were found. The production of plaster of Paris involves a process called calcination, where the gypsum is heated to remove the water content and create calcium sulfate hemihydrate.

  4. Jan 5, 2017 · This led “calcined gypsum” (roasted gypsum or gypsum plaster) to be commonly known as “plaster of Paris”, even after the exhausted quarries were converted into Montmartre cemetery and the Buttes de Chaumot gardens respectively in the mid-nineteenth century.

  5. Mar 24, 2023 · In the 18th century, the French chemist Antoine Lavoisier used plaster of Paris to study the properties of gases. Lavoisier found that when certain substances were burned in a closed container, the weight of the container increased, indicating that something had been added to it.

  6. Oct 16, 2013 · The name Plaster of Paris (POP) had its origins from the fact that it was extensively mined from Montmartre in Paris district. But its use predates the industrial revolution, they have been found on the insides of pyramids.

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  8. It is formed by the partial dehydration of gypsum, a mineral composed of calcium sulfate dihydrate (CaSO 4 .2H 2 O). Manufacturing Process. The process of manufacturing Plaster of Paris involves heating gypsum at approximately 150 degrees Celsius.

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