These microbes feed on sugars in the tomatoes, producing carbon dioxide (CO₂) as a byproduct—which creates bubbles. Unlike harmless gas release, fermentation is ongoing, and may cause:
Persistent foaming
Can bulging
Off odors or flavors
If you suspect fermentation, proceed with caution.
3. What Safe Bubbles Look Like
✅ Normal bubbles are:
Small, clear, and short-lived
Visible only at the moment of opening
Not accompanied by cloudiness, odor, or texture changes
Followed by clear liquid and vibrant red tomatoes
This is simply physics—not spoilage.
4. Red Flags: Warning Signs of Spoilage
🚩 Discard the can if you see:
Foam or froth that lingers on the surface
Cloudy or slimy liquid
Mushy, discolored, or moldy tomatoes
Bulging lid or can (a serious warning sign)
Liquid that spurts or hisses aggressively when opened
These indicate active microbial growth and potential contamination.
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