How can I tell if prepackaged store-bought soups have gone bad?

Any fats contained in the soup may have gone rancid and impart an off odor or flavor. Metal cans containing food in which bacteria, possibly botulinum, are growing may bulge outwards due to the accumulation of gas, a byproduct of  bacterial growth.  Spoiled soups--especially those containing meat, poultry or seafood--will smell and taste foul. The broth or sauce may appear slimy. Spoiled soup also may appear moldy. 
 
Source(s):
Desmene.com "Food Storage" Pantry" 
Wikipedia.org "Botulism"

 

 
 

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