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Bubbles in Canned Tomatoes: Fermentation or Spoilage? How to Tell the Difference

8. How Storage Affects Safety
Even properly canned tomatoes can spoil if stored incorrectly. To prevent issues:

Keep cans in a cool, dry, dark place (ideally below 75°F / 24°C)
Avoid areas near stoves, radiators, or sunny windows
Never store cans in damp basements or garages where temperatures fluctuate
Heat accelerates chemical reactions and can weaken seals, inviting contamination.

9. What to Do If You See Suspicious Bubbles
Stop—don’t pour or taste.
Inspect: Check for bulging, rust, dents, or leaks.
Smell: Sniff cautiously from a distance.
Observe: Look for foam, cloudiness, or discoloration.
When uncertain, discard. It’s never worth the risk.
10. Smart Shopping & Storage Habits
Prevent problems before they start:

Buy from reputable brands and retailers

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