My oldest son made sidewalk chalk last year in a summer class he took… I think it would be a great craft for a summer birthday, BBQ, or The 4th of July… You could make it in Red,White and Blue… too cute!
Homemade Sidewalk Chalk
* Equal parts of water & Plaster O’ Paris (available at Michaels)
* Mix together and let sit for a half an hour. If you would like your chalk to be colored, you can add washable tempra paint at this time.
* Cover the bottom of a toilet paper roll with foil at this time
* Pour the mixture into the toilet paper roll and let sit for at least a day!
mommyapolis 
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