Someone wanted to know if sugar can go bad. According to the October issue of Real Simple sugar can keep up to two years (and sometimes more)--if kept in an airtight, moistureproof container. And brown sugar can be softened by microwaving for 15 seconds, but, because of the molasses in it, it should be used up within a year.
What about baking powder and baking soda? I hate to say when I was young I was known to user the baking soda out of the box in the fridge. Good lordy, learn from my mistakes! That box is there to absorb bad odors--and whatever you're baking will taste like bad smells. Ieew. Use one for the fridge and one in the cupboard. And what about odors in the cupboard? I put my box in a zip-lock baggie to keep it fresh. Real Simple says Baking Soda is good for two years unopened, one year if opened. And baking powder is easy--it has a use-by date printed on the can. Why didn't I ever know that?
They didn't address powdered sugar, which for me always tastes like gym socks and I have to get a new bag if ever I need it. So of course, I never make anything that requires it.
What are your tips for storing powdered sugar?