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In a mixing bowl, mix 2 tablespoons baking soda with 2 tablespoons vinegar until fizzing stops. 4 tablespoons cornstarch. Mix until a uniform consistency. Not liquidy but a bit clumsy Pour the mixture into individual section cups, filling each about a third to halfway. Add five to 10 drops of food coloring to each cup, mixing in thoroughly, to reach desired colors. Allow paints to set overnight. Use paints on watercolor paper with a wet paintbrush.
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