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):
GourmetSleuth.com "Food Storage Guidelines
Ehow.com "How to Determine the Shelf Life of Condiments"
Wikianswers.com "Do Ketchup or Mustard Need Refrigeration?"

 
 

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