Can you use cream of tartar in self raising flour?

Here's why:

* Self-raising flour already contains a leavening agent. This is usually baking powder, which is a mixture of baking soda and an acid, like cream of tartar.

* Adding more cream of tartar would create an imbalance. It would likely result in a dough or batter that is too acidic, making it taste unpleasant and potentially affecting the texture negatively.

If you're using a recipe that calls for self-raising flour, it's best to follow the instructions and not add additional ingredients like cream of tartar.

However, if you are making your own self-raising flour from plain flour, you would then need to add both baking powder and cream of tartar to achieve the desired leavening.