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Homemade sidewalk chalk for kids. need: -1 cup plaster of paris 1 cup water powdered tempera paint molds: paper cups, toilet paper rolls, etc. how to:Mix plaster of paris and water, and add powdered tempera paint until you have the color you like. Pour mixture into a mold such as a paper cup, and allow to dry completely. When dry, tear away the paper cup (or other mold), and start drawing!