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Homemade Sidewalk Chalk

Can't find sidewalk chalk? Make your own! It only requires 3 ingredients and a mold of your choice. In just 30 minutes, you can have your very own homemade chalk.
Prep Time5 minutes
Active Time20 minutes
Total Time25 minutes
Cost: $.50

Equipment

  • Plastic Spoon
  • Small Mixing Bowls or Plastic Cups
  • Measuring Cups
  • Measuring Spoons
  • Mold

Materials

Instructions

  • Combine warm water and plaster of paris in a small bowl.
  • Stir with a plastic spoon to create a thick, soupy paste. Be sure to mix it well, so that there are no clumps.
  • Separate your mixture into 3 separate containers (such as plastic cups), if you want to make more than one color.
  • Stir 1 tablespoon of tempera paint into each of your 3 containers. The more you add, the brighter your sidewalk chalk will be!
  • Transfer the mixture into molds. You can use fun shaped molds or repurposed toilet paper roles.
  • Let the sidewalk chalk dry for 1 to 3 days, depending on the size of the mold chosen. (Toilet paper roll molds may take 3 days to fully dry.)
  • Pop chalk out of the molds and have fun!

Notes

Note:  This plaster of paris chalk mixture will begin to harden within 20 to 30 minutes.  So, it is best to work quickly and wipe up any spills right away.  
 
Also, when packing the chalk into the molds, be sure to pack the chalk down firmly, releasing any trapped bubbles.