Alum Play Dough
I'm told this is one of the best homemade playdoughs around. Even though it will air dry overnight, to keep it pliable for a couple of months all you have to do is keep it in an airtight container when you aren't playing with it. No refrigeration needed with this one.
3 teaspoons alum (available in the grocery)
1 1/2 cups flour
1 cup salt
1 cup boiling water
2 teaspoons vegetable oil
1. Combine the dry ingredients in the mixing bowl.
2. Add the boiling water and the oil.
3. Mix thoroughly.
4. Add this point you can add tempera paints to create a desired color.
Model the dough and let it air dry overnight or store unused dough in an airtight container.