Originally Posted by
tranum
Many, many years ago, my home ec teacher told us don’t use old baking powder and I follow that rule. I threw out my DIL’s old baking powder when I was staying with the grandkids. I replaced it with fresh and when she returned, I told her. I don’t think she approved.
You're home ec teacher was right to say that, although it has nothing to do with food safety. However, baking powder does loose its raising power over time, so using old baking powder won't get you an upset tummy or such, but can result in a flat cake... BTW: If baking powder changed its colour slightly and has a pink shine, it's definitely too old and should be replaced!