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Explanation: for a recipe, you would only need to say "baking powder"
Royal is the brand, and in Mexico it used to be the only brand available (don't know now). So recipes would say: una cucharadita de Royal (o polvo royal). So it's like Kleenex or "pan bimbo" (which in Mexico is how sliced bread was called, as that was the first brand -it would not be unusual to say: trae una bolsa de pan bimbo de wonder...)