1 cup cornstarch
2 cups baking soda (1 LB package)
1 1/4 cups cold water

Directions:

Stir starch and soda together. Mix in cold water and stir over heat until mixture has consistency of mashed potatoes. Turn onto a plate and cover with a damp cloth until cool enough to handle. Then knead. Use immediately or store in an air-tight container. This dough has a smooth consistency. It is good for ornaments, modeling, or pottery. It can be rolled thin and cut with cookie cutters. Dries at room temperature in 3 days. Or dry in a 200 degree oven.