Does Baking Soda or Baking Powder Go Bad? Try This Test! | The Kitchn
America's Test Kitchen - We compared 6-month old baking powder with 10-month old baking powder, and found that biscuits made with 10-month-old powder did not rise properly. We recommend writing the date
Baking Soda - Does it expire? And how to test if it still works! — Gygi Blog
Expired or Still Good? The Quickest Way to Test Baking Soda & Baking Powder for Freshness « Food Hacks :: WonderHowTo