You can use a straw instead of droppers. Today, you are going to investigate water to see if it has a skin. Ask students to use the toothpick to make discoveries. Look through the water bubble. Keep the four drops separate.
Students divide each of the colored drops into three drops.
Combine one red and blue drop. Combine one red and yellow drop. Combine one blue and yellow drop. Combine one red, yellow, blue drop. Give each student one drop of soapy water.