In medium pan, mix 1 cup cornstarch and 2 cups baking soda. Add 1 1/4 cups cold water and stir over medium heat until mixture has the consistency of mashed potatoes. Remove from pan, cover with damp cloth until cool enough to knead. Store in airtight container. This clay makes great Christmas ornaments, pottery, or sculptures. It works best if dried at room temperature for 3 days, but can be dried in a 200 degree oven for 1-3 hours, depending on the thickness of the clay piece. Love, Mrs. Brown.