The Colored Cube experiment is great for teaching kids primary and secondary colors. All you need is Sprite and colored ice cubes (2 red, 2 yellow, and 2 blue). Put a red and yellow cube in one cup, blue and yellow in a second cup, and red and blue in a third cup. Next, pour Sprite into all of your cups. Voila, kids see how primary colors mix in action! Below is an experiment my class conducted.