Sugar Plum Fairy and I just finished a fun science experiment/craft project this week.
We made egg shell geodes.
We started off with clean egg shell halves...just rinse in warm water to get the membrane out.
After the shells were dry, we painted the inside with white glue and sprinkled alum to cover..
I used the alum in the spice section of my grocery store.
I used 4 little jars for this project.
We then added 3/4 cup of alum to nearly boiling water and stirred to dissolve.
After the mixture cooled for about 15 minutes, we divided into 7 jelly jars...6 would have been better...and added food coloring to reach the desired hues.
We then gently placed a shell into each jar.
I found using a skewer helped submerge the shell without dying my fingers.
These then sat on the counter for 24 hours.
When they emerged...voila...sparkly geodes!
The process simulates sedimentation in nature and is fascinating!
The color has faded over a couple days, but they are still lovely and will make their way into our spring décor soon.
(The complete directions are from a cute blog called Make Life Lovely)