How can I tell if ketchup and mustard have gone bad?

Ketchup and mustard won't become unsafe to eat, though either may lose flavor and possibly nutrients over an extended period of time--a year for ketchup and 2 years for mustard. 
Source(s): "Food Storage Guidelines "How to Determine the Shelf Life of Condiments" "Do Ketchup or Mustard Need Refrigeration?"


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