Instructions: 1. Mix vinegar and baking soda together in a small bowl.

2. When mixture stops foaming, add cornstarch and glycerin.

3. Pour into bottle caps or egg carton.

4. Add several drops of different colors to each cap or carton cup. Stir until color is well mixed. Be sure to add plenty of coloring, since the tint will lighten upon drying. Mix primary colors to make secondary colors. For really intense colors try Kool-Aid or food coloring gels (Wilton makes great gels).

5. Let set overnight to harden.

Note: After about the first batch, I started to make each of the primary colors up in a single batch. Also the plastic cups that Crystal Lite comes in makes great pots.

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