Make erupting ice chalk paint. 1/4 cup each baking soda and cornstarch. add liquid watercolor paint and 1/2 cup water. Mix well w/spoon. Pour into ice cub tray & freeze. After it starts to melt, use squeeze bottle or baster to add vinegar & make them foam.
Fill water balloons with colored water then pop them in the play pool - Kids will be delighted to see the water change colors! A fun sensory experience as well as a lesson in color theory. We love summer!