1 cup Used coffee grounds
(If you are making several batches of eggs, call a local coffee shop to ask for some coffee grounds. A lot of shops save them for local community gardens.)
1/2 cup Cold coffee
1 cup Flour
1/2 cup Salt
Stir the coffee grounds, cold coffee, flour and salt until well mixed. Knead together and flatten it out onto the waxed paper.
Use the can to cut circles or the knife to cut slabs.
Press your objects firmly into the dough, when you take the
object out, you have your fossil.
Let dry overnight and hang.
These are great to put little toys or clues in. They really look like rocks!