For children ages 4 and older.

Mix together 1/2 cup of plaster and 1/4 cup water in a clean plastic container (or follow package directions).

Cover a seashell with petroleum jelly (Vaseline). When the plaster begins to set (thicken and harden slightly), press the shell into the plaster.

Let it dry overnight and then remove the shell (it should slide out easily).

Use the plaster mold to make clay fossils.

You can also use plaster to preserve a child’s hand or footprint. The plaster washes off skin easily with warm water, but make sure you run lots of water down the drain!

Handprints make wonderful gifts for parents and grandparents.