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plaster of paris |
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plaster of Paris: see gypsum gypsum (jĭp`səm), mineral composed of calcium sulfate (calcium, sulfur, and oxygen) with two molecules of water, CaSO4 ..... Click the link for more information. . plaster of parisQuick-setting gypsum plaster consisting of a fine white powder, calcium sulfate hemihydrate, which hardens when moistened and allowed to dry. It is made by heating gypsum to 250–360°F (120–180°C). Used since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found in Paris. It is used to make molds and casts for ceramics and sculptures, to precast and hold ornamental plasterwork on ceilings and cornices, and for orthopedic bandages (casts). In medieval and Renaissance times, gesso (plaster of paris mixed with glue) was applied to wood panels, plaster, stone, or canvas to provide the ground for tempera and oil painting. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Against one wall was a plaster of Paris plaque of an O'Callahan in a Roman helmet. "He'll always be lame," the surgeon said, wiping his hands and gazing down at Michael, who lay, for the most part of him, a motionless prisoner set in plaster of Paris. I saw iron ladles, pans full of white sand, files with white metal left glittering in their teeth, molds of plaster of Paris, bags containing the same material in powder, a powerful machine with the name and use of which I was theoretically not unacquainted, white metal in a partially-fused state, bottles of aquafortis, dies scattered over a dresser, crucibles, sandpaper, bars of metal, and edged tools in plenty, of the strangest construction. |
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