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Royal Baking Powder was a single-acting product made years ago. Here's a recipe for single-acting baking powder you could use in old recipes calling for Royal brand.
2 tablespoons cream of tartar
1 tablespoon baking soda
1 tablespoon cornstarch
Combine ingredients and store tightly covered. For double-acting baking powder, use 1/4 teaspoon of baking soda and 1/2 teaspoon of cream of tartar for each teaspoon needed.
Recipe submitted by Jim Catanich
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