How Can You Tell If Cocoa Powder Has Gone Bad?
Cocoa powder can last for a long time if stored properly, but it can still go bad. The easiest way to tell if cocoa powder has gone bad is to check its appearance, smell, and taste. A bad cocoa powder will have a dull color, stale or rancid smell, and a bitter or sour taste. If you notice any of these signs, it’s best to throw it away and get a fresh batch.