Geode Making Supplies

• McCormick ALUM 
• 3 eggs
• White glue (Elmer’s works great, or any other white glue is fine)
• Paintbrush
• 6 small glass jars (I used small mason jelly jars)
• Food coloring
• Newspaper

How to Grow a Geode From an Egg
STEP 1.  Carefully crack open your eggs.  Try to keep both eggshell halves the same size if you can.

STEP 2.  Rinse out your eggs with some warm water, and use your fingers to remove the inside membrane from the shell.  Let dry completely.
​Use a paintbrush to paint white glue all over the inside and cracked edge of the eggs.  Generously sprinkle alum all over the glue, and let the egg shells sit out overnight to dry.

STEP 3.  This is where my directions differ from Martha’s.  You’ll need two cups of VERY hot water (almost boiling).  My tap water gets really hot, so I just used that, but you may need to heat yours up depending on your water temperature. Add 3/4 cup of alum to the hot water, and continue stirring until the alum is completely dissolved.  It is important that the crystals are completely dissolved!  If they do not dissolve after stirring, then place in the microwave for a minute at a time to dissolve the alum.

STEP 4.  Once the crystals are completely dissolved, pour the mixture evenly into six small glass jars (see photo).  The small mason jelly jars I used were the perfect size! Add about 20-30 drops of food coloring to each jar, and stir the color in with a plastic spoon.  Feel free to mix colors!

Step 5.  Let the mixture cool in the jars for about 15 minutes, and then carefully add one egg half to each jar, making sure that the egg half is completely covered by the colored alum mixture. Let the eggs sit untouched for 12-24 hours.  You can carefully check an egg after 12 hours, and if you want larger crystals, then place the egg back in the solution for longer. When your crystals are your preferred size, then carefully pull the egg halves out of the jars, and let them dry.
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Now you have your own beautiful geode eggs!