I came across this recipe for play dough on the website of Peapods, a St. Paul store that carries natural toys and baby products.
Combine in a small pot:
1 cup flour
1/4 cup salt
2 tbsp cream of tartar
1 cup water
1 tbsp vegetable oil
Stir until combined, then (if desired) add:
20-30 drops food coloring
Cook over medium heat for about 4 minutes, stirring constantly. When dough thickens and pulls into a ball, turn it out onto a cool surface. Knead it when it’s cool enough to touch.
Store in the refrigerator in a sealed container.