Instruct students to poor mixture through coffee filter in the second cup. Let as much of the water drain as possible. Scrape solids left over in coffee filter into third cup and stir in the baking soda to make glue. Test your glue by sticking a few small pieces of paper together and let it dry overnight. Have students use a cotton swab to paint the black side of the shape with the Epsom salt mixture.
Students use the concept of liquids and solids that make crystals to create zoom balls.
Have students compare the differences between the balls, i.e. how high it bounces, shape, size, etc. The McGraw-Hill Companies, Inc.