"Cream of tartar is found in some baking powder, and is often used to help stabilize egg whites, or to produce creamy frostings and candy. If a cook is out of baking powder, he can substitute cream of tartar and baking soda, carefully, to mimic the action of baking powder, which is actually formed from these two compounds. However, homemade baking powder can pack a kick, so it should be substituted with great care. This is how most cooks made their baking powder before it became commercially available."
''Cream of tartar also has other household applications. It can be used to clean brass and copper cookware. It is also helpful in removing stains from sinks and bathtubs. Cream of tartar and hydrogen peroxide can remove even the most stubborn rust stains, without scratching a delicate surface. Always test the solution in an inconspicuous area first, however, to ensure its suitability for use on that surface.''
at 3:24 PM on Nov. 5, 2010