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By popular demand:
 
Play Clay recipe (as found on Arm & Hammer Baking Soda, Bicarbonate of Soda,
sodium bicarbonate):
 
1 one pound box of baking soda
1 cup corn starch
1 1/4 cups cold water
 
Stir together baking soda and Corn starch in saucepan
Add water abd cook over medium heat until mixture reaches consistancy of
moist mashed potatoes (approximately 10-15 minutes.)
Remove and put on plate. Cover with a damp cloth. When cool enough to
handle, pat until smooth.
 
Sarah Rogers