Step 2: Prepare the eggshells
If you eat eggs, then save the eggshells when you use them. If you don't eat eggs, ask a friend to save the shells and carton for you.
1. Carefully crack the top third of the egg. You can do this by tapping the egg on the edge of a bowl, or tapping with a sharp knife.
2. Empty out the eggshells completely.
3. Wash the eggshells out well.
Optional step: If you are concerned about salmonella on the eggshells, put the empty eggshells in a pot of boiling water for a few minutes.