To make your own fizzing sidewalk chalk you need:
- A container of baking soda
- 1/2 cup of cornstarch
- Warm (almost hot) Water
- Food coloring
- Vinegar in a spray bottle
Mix the dry ingredients and then add water stirring until its not too thick. I think we used about a cup. This is a fast drying mixture so mix it in a container that you can easily re-seal.
Now for the fun! Allow the kids to paint the sidewalk, let dry then spray the paint with a bottle of vinegar and watch the fizz appear.
To clean up, simply dump copious amounts of water over "art", once sidewalk is dry you can start again.
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