For the most part- yes. The ones that have a high vinegar and/or salt content SHOULD be fine. You will notice some darkening though. Oxidation is both normal and natural and harmless. It is just like taking a bite out of an apple & leaving it on the counter for a bit. It's not bad, it just looks bad. What you want to watch out for is fizzing or fuzzing. If it fizzes it is a sign that things are active. Not all active things are bad, but not all are good either. Lab testing would be expensive so pitch it. Same story with fuzzy as well. Try storing in a cool place such as a basement. -Jim C MWPH