3 tbsp. sugar
1/2 c. cornstarch
2 c. water (cold)
Food coloring
Dish detergent

Mix sugar and cornstarch together in a saucepan. Add cold water and stir completely. Cook over low heat, stirring constantly about 5 minutes. Cool, then divide into 4 cups or bowls. Add food coloring and a drop of detergent to each bowl.