- 1). Set the pan on a work surface that can get dirty. Let children pour in the play sand until it is about two inches deep. Help them sprinkle the sand with water until it becomes damp and holds a shape, such as you would when making a sand castle. It should have the consistency of oatmeal.
- 2). Have children take the sea shells, or any other firm object or toy such as a rubber dinosaur, star fish or toy figure, and press it firmly into the damp sand to create an impression. Carefully remove the item to avoid disturbing the sand around it. The cavity left will become the mold for the fossil.
- 3). Mix the plaster of Paris as directed on the container. Immediately pour the plaster mixture into the sand impressions. Be careful to keep the plaster only in the impression; it may be easier to use a disposable plastic spoon to put the mixture into smaller molds.
- 4). Let the plaster dry for 45 minutes or until hardened. Remove the fossils from the sand.
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