Fermentation-induced bubbles may also be accompanied by other signs of spoilage, such as discoloration of the tomatoes or liquid, a change in texture, or the presence of mold. If any of these signs are present, it’s best to err on the side of caution and discard the product.
5. The Smell Test: Sour, Yeasty, Or Off Odors Explained
The smell test is a reliable method to assess the safety of canned tomatoes. A fresh can of tomatoes should have a clean, slightly acidic tomato aroma. If you detect sour, yeasty, or otherwise off odors, this could indicate spoilage or fermentation.
Sour or pungent smells can be indicative of lactic acid bacteria activity, while a yeasty smell might suggest the presence of yeast fermentation. Both are signs that the product may not be safe to consume.
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