How to Make Dinosaur Bones

eHow may earn compensation through affiliate links in this story.

Things You'll Need

  • 1 cup sand

  • 1/2 cup water

  • 1/2 cup cornstarch

  • 1/2 tsp. alum spice

  • Saucepan

Making dinosaur bone fossils is a fun and creative way to teach kids about archeology and the many discoveries that have been made through digging up old bones. In only a few minutes you can create a mixture that will harden into a structure resembling an aged, fossilized dinosaur bone. Most of the ingredients you can find around the house, and in no time you will be hosting fossil hunts of your own.


Step 1

Add 1 cup of sand, 1/2 cup of water and 1/2 cup cornstarch in a saucepan. You may want to use an old saucepan, as the gritty sand may ruin the finish of a newer pan or remove non-stick coating. Stir the mixture well.

Step 2

Add 1/2 tsp. of alum to the mixture and stir thoroughly.

Step 3

Place the saucepan on a burner set to medium heat. Stir the mixture constantly. It will begin to turn into a liquid as it heats.


Step 4

Remove the mixture from heat after about two to three minutes, or when the mixture has reached a consistency like cookie dough.

Step 5

When the mixture has cooled, scoop it onto a clean surface and mold it with your hands into the shape of a dinosaur bone. Use your imagination to create various shapes resembling leg bones, claws and even dinosaur skulls.

Step 6

Leave the shaped dinosaur bones in a warm place to dry. After a few days you will have hardened sculptures that will resemble aged and fossilized dinosaur bones.


Hide the fossils in a sandbox to create a fun activity for kids. Provide shovels and brushes for a fun excavating adventure.