A very popular natural leavening agent used in baking. It is gluten-free and aluminium-free & contains bicarbonate of soda (Baking Soda), cream of tartar & organic rice flour.Did you know you can make self-raising flour from plain flour using baking powder? Visit the "how to use" tab below to find out how. Due to the way the chemicals react in our baking powder (see below) it is important that once you add the liquid to it the recipes, you get it in the oven ASAP. A bit of Baking Powder History.... Originally baking powder was made from baking soda (sodium bicarbonate) and creme of tartar (tatric acid), like ours is. For the chemists in the kitchen out there, the baking soda is alkaline and the creme of tartar is acidic. When the two are combined and liquid is added a chemical reaction happens, carbon dioxide is made and the product will rise (i.e. acts as a leavening agent).