1 tablespoon white vinegar
2 tablespoons baking soda
1 tablespoon cornstarch
1/4 teaspoon glycerin
Plastic bottle caps from 2 liter bottles (saved and cleaned ahead of
In a small bowl, mix the vinegar and baking soda together (bubbles up).
When it finally stops bubbling, add the cornstarch and glycerin, mixing
Pour the mixture into several bottle caps (one for each color you want).
Add several drops of the food coloring into the cap and, using the
toothpick, blend well.
Let them dry overnight before using.
*Children should always be supervised when preparing or cooking in the
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