Pearly Soda Clay
This is gorgeous stuff. Smooth and silky in your hands, it has a porcelainlike finish and a soft, eye-catching shimmer when dry.
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1 cup baking soda
½ cup cornstarch
 ¾ cup water
 Food coloring (optional)
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In a saucepan, stir together the baking soda and cornstarch. Add the water, mixing well. Â Cook the mixture over low heat (adults should supervise), stirring occasionally, until it resembles mashed potatoes, about 7 to 10 minutes. You will need to stir it almost constantly the last few minutes as it thickens. Â Remove the pan from the heat and set it aside. When the dough has cooled, turn it out onto a floured board. Knead the dough with your hands, adding more cornstarch as needed, to create a workable clay. Â For tinted clay, knead in a few drops of food coloring. Allow creations to air-dry overnight. Refrigerate any leftover dough in a ziplock bag for up to three days.