This fun Halloween activity is spotted from Growing a Jeweled Rose
It is very easy to do and the kids will love it.
First, you have to carve your Jack-o-lantern. If you haven’t already done so, here is a how-to guide from Instructables
Next, place about 4 tablespoons of baking soda inside and add a few dropps of food coloring (optional).
The last step is to poor some vinegar in and watch the fizz pour out of the mouth.
You can experiment with different amouts of baking soda and vinegar for effect.
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