This recipe is from the WEE school curriculum.
Mix 1 cup of flour, 3 tsp of cream of tartar, 1/2 cup of salt, 1 cup of water and a few drops of flavoring (vanilla, peppermint, etc...). Cook over medium heat, stirring constantly until stiff. Knead; store in airtight containers.
You can add color to this playdough with food coloring if you want to. Just seperate dough into handsized bits and place in plastic baggie with the food coloring. Seal the baggie and then knead the dough through the bag. You can even have the kids do this.
This dough will dry and harden if left out. So it can be shaped and sculptured. The oil has been omitted from the recipe to allow this to happen.
Another Play Dough recipe that includes oil is:
1 cup flour
1/2 cup salt
2 teaspoons cream of tartar
1 tablespoon cooking oil
1 cup water
Mix dry ingredients. Mix oil in water and add dry ingredients to it. Stir and pour into pan. Stir constantly until dough pulls away from sides of pan. Empty onto wax paper and knead. Add color after dividing.
Enjoy playing with PlayDough!