Eggshell Geodes
How to make eggshell geode crystals with alum
Ingredients
- 3/4 cup alum powder
- 2 cups water
- 1 drop gel food coloring
Instructions
- Prepare clean eggshell by applying a thin layer of glue to the inside. Sprinkle alum powder over the glue and set to dry.
- Heat water in a small saucepan until boiling. Pour into a wide jar.
- Stir in alum powder until it dissolves in the water. Add gel food coloring then let the water cool for 30 minutes.
- Place the eggshell in the alum water for 12-24 hours. Then carefully remove with a spoon. Allow the geode to dry on a soft towel before handling.
Notes
This recipe calls for 3/4 cup of alum powder plus more for sprinkling on the eggshell. The alum water can be reactivated for a new geode by reheating and stirring in 1 tsp of alum powder.