Cream Of Tartar SKU: 00069 $0.00 Size -- Please Select --1 lb + $16.34 4 oz + $5.82 8 oz + $9.41 5.4 oz jar + $8.18 Add to cart Potassium bitartrate. Found in the tartars in wine making. Use in angel food cakes. It affects the color & tenderness of the flour and egg white proteins. Add when the beaten egg whites are just foamy.