Baking Supplies | FRONTIER CO-OP CREAM OF TARTAR, POWDER IS NEVER TESTED ON ANIMALS. THIS PRODUCT IS AN INDISPENSABLE INGREDIENT IN BAKING AND ACTS AS A LEAVENING AGENT IN CAKES, QUICK BREADS AND SOUFFLES WHEN COMBINED WITH BAKING SODA AND WATER. FRONTIER CO-OP CREAM OF TARTAR, POWDER ALSO AIDS IN S..