How to Make Homemade Baking Powder

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Here is a recipe for and essential ingredient in many baking recipes. I add it because it can be cheaper to make it in bulk on your own (depending on if you can get cheap cream of tartar -- a byproduct of wine making), and because many commercial baking powder products contain aluminum sulfate. This recipe keeps aluminum out of your food.
Ingredients:

1 teaspoon baking soda
2 teaspoons cream of tartar
1 teaspoon corn starch (optional -- used to reduce caking, which what the sulfate does)

Procedure:

Mix the baking soda and cream of tartar together until well combined.
Use immediately

If you want to store it, add a teaspoon of corn starch to the mixture, and stir.
This will absorb any moisture from the air, store in an air-tight container.