Thursday, February 7, 2013

DIY Eggshell Sidewalk Chalk

Yes. You read the title correctly.  Last week I tried making sidewalk chalk out of eggshells... and it worked!  Here's the proof:

DIY Eggshell Sidewalk Chalk

how to make sidewalk chalk with eggshells

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Amazing, right?  I was surprised too.  I found the recipe in the book, Concoctions.  Use eggshells to make chalk?  It sounded so bizarre that I had to try it out.

Now here are two things to note in case you want to try this yourself:
1.  Chalk is super cheap.  There's no way this eggshell chalk could take the place of store bought chalk.  I made it to appease my crafty curiosity.  If you have curious kids, they might have fun making it too.

2.  This chalk is highly abrasive, so do not use it on blackboards.  Use it outside.   (I tested a small bit on my chalkboard table and scratched it up.  So trust me on this one.)


- 6 eggshells
- Wax paper
- Rolling pin
- Large plastic bag
- 3 t flour
- 3 t very hot tap water
- Food coloring
- Small bowls
- Spoons
- Silicone Molds (or you could just use a paper towels*)


1.  Wash and dry your eggshells.

2.  Grind your eggshells into fine powder.  There are probably better ways out there, but here's how I did it.  I placed my eggshells between two sheets of wax paper and I used a rolling pin to roll over them.  As my eggshell pieces became smaller and smaller, I began folding all four sides of the wax paper to keep them in a pile in the center.  After awhile my eggshell pieces were getting so small and sharp that they tore small holes in my wax paper.

I didn't want to loose any precious eggshell powder, so I placed the wax paper and eggshells into a large plastic bag.  I used the rolling pin to repeatedly hit the bag until my eggshell pieces were smaller than grains of rice.  (Baby Chuck helped out with the banging part.  We put a book under our bag just to absorb some of the noise so our neighbors below wouldn't get too upset.)

Our poor neighbors weren't feeling the love that day...
I stopped when my eggshells were this small.  (Let me know if you figure out a way to get them smaller... I'd love to hear any ideas.)

3.  Add 1 teaspoon of flour, 1 teaspoon of very hot tap water, and three drops of food coloring in a small bowl.  Stir them together to create a colored paste.  Add in 1 tablespoon of your eggshell mixture. Mush all the ingredients together.  Then, spoon your mixture into one of your silicone molds.  Repeat this process until you run out of eggshell powder.  I found that I had enough to make 2 1/2 little pieces of chalk.

*Note:  If you don't have silicone molds, the book recommends that you shape the mixture into a chalk stick and then roll that stick tightly in a paper towel to help it keep its shape.

4.  If you're using silicone molds:  Let them dry one day in the molds.  Then, when the top part seems dry, carefully pop them out and flip them over so that the bottom side can dry out too.  Wait two more days (or until they seem rock hard.)

*If you're just rolling everything up in a paper towel,  the book recommends that you wait 3 days to let your stick dry.  After it's really hard just rip off the paper from one end to use.

5.  Enjoy your curious chalk creation, you crafty minx.  (Ooh.  Alliteration!)


  1. oooh what if you put them into a food processor!

  2. great idea! i really liked this one :D way to be nontoxic to the environment! and good fertilizer too...

  3. I would guess you might able to use a burr style coffee mill on the finest setting to get a very fine powder. They go for $20 on a cheaper model on up. I've had mine for a couple of years and use it almost every day for coffee. It was a $20 model and well worth it. I imagine putting egg shell though it wouldn't even affect the taste of the coffee that went in after....

    1. thanks for the suggestion. i'll def look into it. :)

  4. I love sidewalk chalk, but my husband draws weird things... He's s sailor... lol Thanks for sharing @ Submarine Sunday!

    1. yeaa... what does he draw?

      Leslie, thanks for the great ideas. found you through kidscreativechaos.

  5. if you wanna get them smaller,a food processor or a mortar and pestle would probably work.

  6. Fantastic idea for using egg shells! I use them in the garden, and in my homemade toothpaste. To grind them into a fine powder I use a blender. Depending on the quantity of egg shells you're grinding, as they grind down you may have to stop the blender and stir them up a bit periodically to get rid of the air pocket around the blades. Also, wait a few seconds for the dust to settle before opening the lid. Might not scratch the chalkboard if the eggshells are ground into powder?

    1. Those are some good tips. Yes! I definitely think they would scratch up the chalkboard. So definitely use these outside! I just think it's so cool to turn something old into something new!

  7. I like this recipe because its the smallest one I have found. Because of the fact you stated it turned out grainy I am going to attempt breaking the egg shells down in the Ninja Blender, that should fix the issue ;)

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