Quick Egg Carton Geodes

March 13, 2016

All the wow factor with none of the wait!

Epsom salt
Sandwich bags
Liquid food coloring
Egg carton
Paint brush
*Optional* glossy Modge Podge or similar top coat

1)  Pour Epsom salt into sandwich bags.  You will want a bag for each color crystal you want to make.  We added about 1/4 to 1/2 cup of salt to each bag.
2) Add a few drops of liquid food coloring into each bag.  Seal and shake till salt is evenly colored.  Add more food coloring if more saturated color is desired.
3) Cut apart egg carton. Separating it into individual cups. You will have 12 cups from the top of carton and 12 from the bottom.
3) Pair up a cup that came from the top and one the came from the bottom of the carton. You will have 12 whole rocks.
3) If necessary, trim edges of each half so the pieces fit together flush.
3) Generously coat the inside of each cup with glue.
4) Add a scoop of Epsom salt to both sides.
5) Tape together the top and bottom of the rock and shake.
6) Open, dump out excess and be amazed!
7) *Optional* after geodes dry, add coat of Modge Podge or similar topcoat to the Epsom salt to increase their shine.


  1. Replies
    1. I just tried this and they turned out great! I also tried liquid watercolors but the food coloring was much more vibrant! What type of food coloring did you use?

  2. Anonymous18.6.17

    Can this be done with Styrofoam egg cartons, or do they have to be cardboard?

    1. I used paperboard cartons for 2 reasons:
      1. I painted the inside of the cup before adding glue and salt;this helps hide any spots the salt doesn't stick.
      2. The texture and color more closely resemble rock

  3. How long does it take these to dry?

    1. What's a good follow-up activity with these?

    2. They dry overnight if the weather is dry and the coat of glue isn't too thick.

  4. Little tip use puzzle glue it dries faster than modge podge and still shines like the modge podge does.