10 Signs Your Canned Food Has Gone Bad
10 Signs Your Canned Food Has Gone Bad by: Daphne Cybele Van Schaick – Off the Grid News
Do you know how to tell if the can or jar of food in your stockpile is safe? Some dents are ok, but these 10 signs mean that your particular can or jar is not safe to eat.
1. Bulges in the lid of a jar, or the lid or sides of a can are a sign that something is seriously wrong with the contents. Canned food should not create a bulge. If you see a bulging lid or side, it’s a sign of pressure from gas, bacterial activity and spoilage. Don’t eat the contents of any bulging can or jar with a bulging lid.
2. Excessive pressure release when opening a jar is a sign something is wrong. It’s normal to hear a light “whoosh” when opening a sealed jar, but a lot of pressure or even a surprising amount of pressure releasing on opening is not a good sign. It could mean gas has built up inside the jar as a byproduct of bacterial activity. If something doesn’t seem right, throw out any can or jar that does this.
3. Bubbles are a sign of spoilage. Bubbles usually indicate some kind of fermentation, a bacterial process which can be perfectly fine IF intentional and under certain specific conditions, and makes excellent pickles, wine, beer and other foods.
However, unintentional fermentation is rarely a good thing, and under low-acid or low-oxygen environments some bacteria can lead to deadly problems, including botulism. If you open a can or jar that’s been sitting on a shelf and you see bubbles, something isn’t right.
4. Foam is an indicator of bacterial activity. Botulism and other dangerous bacteria can survive (and even thrive) in very low-oxygen environments like canned food.