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How to make eggshell geode crystals with alum
gel food coloring
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.
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.