I have always wanted to make egg geodes with the kids. We finally did it!
It’s a fairly simple science project & can be done in a day or two. Most of that time is waiting for the crystals to form. We remade our mix 2 extra times, so it took us about a week to complete. With the exception of the alum, the supplies are items most people already have at home.
DAY 1: PREPARING THE EGGS
I carefully split open & washed 6 eggs.
Next, the kids spread regular ol’ school glue inside each of the egg shells.
Then they sprinkled alum on the wet glue. You want to cover the inside & top edge of your egg completely with alum. This alum gives the dissolved alum someplace to stick to when it cools & starts to form crystals.
I’m guessing the cheapest way to buy the alum is finding it in bulk online. But, I didn’t think that far ahead, so I just bought 4 small jars of McCormick’s alum at the super market.
The eggs dried overnight.
I put about 2.5 cups of water in a saucepan, then set it on the stovetop to heat the water. Right before it started boiling I dumped in 3 little jars of alum. After the alum dissolved I poured the mixture into 7 containers. Then, I added different colors of food coloring to each container. After the water cooled just a bit, I added an egg half to each cup. Then we let the eggs sit in their colored alum water for about a day and a half before checking them.
DAYS 6, 7, & 8