- Mix together 1/2 cup cornstarch with four cups of very cold water. Put it into a pot and turn the heat on high, letting the mixture come to a boil and continue to boil until it's thickened. Allow it to cool and pour into smaller containers such as baby food jars or plastic yogurt tubs, etc. Add several drops of food coloring to each jar and mix well. You should get about six jars of paint.
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