How Do You Know If Jam Has Gone Bad?
You can tell if jam has gone bad by looking for signs of mold, discoloration, or an off smell. If the color has changed from its original hue, or if there are clumps floating on the surface, that means the jam is no longer safe to consume. Additionally, if the jam has been sitting in the fridge for a long time past the expiration date, it is best to assume that it has gone bad and discard it.