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Self-rising flour (usually) has baking powder mixed into it in a certain ratio. Baking powder is used for rising baking such as cookies, biscuits, cakes, etc. It isn't appropriate for use with yeast because yeast is a raising agent. Baking powder creates gases that bubble and puff up baking by way of a chemical reaction. Yeast is a form of bacteria that eat sugar and excrete CO2, which is a gas, that puffs up baking by way of a biological reaction. If you used self-raising flour with yeast you would have two competing forms of raising agent - and I have no idea what kind of mess you'd find in your oven afterwards!

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15y ago

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