1/19/2024 0 Comments Plaster of paris powder![]() ![]() Chalk and limestone are calcium(II) carbonate and gypsum is calcium(II) sulfate. Like chalk and limestone, gypsum is found as a mineral rock. Compare the wax approach with the Plaster of Paris and evaluate which gives the best impression. Try to find out about the lost wax process and see if you can devise a method of getting a lost wax impression of the teeth marks. ![]() Can you identify whose teeth or tool made the indentations in the apple?.After 24 hours cut the apple away from the plaster cast and rinse the cast under the tap.This will take about 48 hours but it can be much less depending on the age of the Plaster of Paris. Pour it carefully but quickly into the teeth or other indentations you have made in the apple or fruit.(A 3:2 ratio will make a good consistency) Mix in enough plaster of Paris to make a thick smooth cream.One-quarter fill the disposable cup with water.You should leave the coin or key in place. Spread the paste thickly onto a piece of cardboard using the spatula. Add water until you have a thick smooth cream. ![]()
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