Question: D.I.Y clay with cornstarch and baking soda.
Option 0: Add one cup of cornstarch to 1.5 cups of baking power.    Add one cup of water to make a slurry and look till it is the right consistency.    Cool and use to mold or sculpt.
Option 1: Add one cup of cornstarch to 1.5 cups of baking soda.    Add one cup of water to make a slurry and cook till it is the right consistency.    Cool and use to mold or sculpt.
Answer: 1