Self-rising flour has flour, baking soda and salt usually. Here are some bits from the web on how to tell the difference:
In the kitchen, to test whether flour is plain flour or self-raising flour, place a little on your tongue. If you feel a tingle, this indicates that the flour is self-raising flour.
There are two ways to tell! One is to rub a bit between your fingers; the self-rising flour will feel a little gritty. The other way to tell is to taste it - the self-rising flour will be salty.
If your taste buds are working good you will be able to taste the difference. The plain flour will have "Blah taste" The self rising flour will have a slight salty taste. and you might even be able to taste the mild acid taste of the baking powder. Also you could mix a couple table spoons with water to form a dough from each canister about the size of your thumb place in oven a few minuets the self rising will be lighter than the regular.
Two ways come to mind. Since self-rising flour contains baking soda, try adding some vinegar and see if it bubbles. Also, the next time you have a hot pan, take about a teaspoon of the flour, add some water and make a small pancake. Toss it in the pan, and if it rises, it's self-rising flour. Good Luck!
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