Baking powder

Definition and stakes

Woman's Institute of Domestic Arts and Sciences,  Woman's Institute Library of Cookery…

“ Baking powder, which is also an important leavening in cakes, should be of an approved brand that can be relied on to do the work expected of it. Soda and cream of tartar are sometimes used together, and, again, soda is used alone with molasses or sour milk. For every 3 eggs in a cake mixture, 1 teaspoonful of the baking powder called for in the recipe may be omitted. Altitude affects the amount of baking powder required in cakes. ”
Source: Gutenberg

Carlotta C. Greer,  School and Home Cooking

“ The price of certain types of baking powders is much greater than that of others.
QUANTITY OF BAKING POWDER IN QUICK BREADS.—Since baking powder contains both acid and alkaline materials, the quantity of baking powder used in a quick bread is dependent not upon another leavening material, but upon the quantity of flour and eggs. When no eggs are used, 2 tea-spoonfuls of baking powder should be used with 1 cupful of flour. When eggs are added to a quick bread, the quantity of baking powder should be lessened 1/2 teaspoonful for each egg.
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Source: Gutenberg

Royal Baking Powder Company,  New Royal Cook Book

“ Housekeepers are urged to avoid substitutes for Royal Baking Powder. Failures in baking often result from the use of sour milk and soda, or even home made mixtures of cream of tartar and soda, because of inability to determine the uncertain strength of such materials and hence the proper proportions to use. ”
Source: Gutenberg

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