Mix cornstarch with 3/4 cup cold water in a medium saucepan. In the meantime, soak gelatin in 1/4 cup cold water. Stir 2 cups of hot water into the starch mixture and cook over medium heat until it comes to a boil and in smooth. Remove from heat and bend in softened gelatin. Add detergent and stir until dissolved. This makes about 3 cups. Food coloring may be used for coloring. Painting works best on glazed shelf paper or butcher paper.
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