Why some ingredients can last a long time, but when used it can only last a few days in the fridge?
In: 5
Jars, cans, plastic containers, etc can be completely sealed. That means no bacteria, fungal spores or anything else can get in. So if you kill everything in the container at the time of manufacturing, primarily done by heating it up, it will last for a very long time even if not refrigerated.
When you open the container you let bacteria and fungal spores in and they can start to glow. Keeping it in the refrigerator just slows down the growth it does not stop it.
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