Imagine you have two rooms. One has a temperature of 110 degrees Fahrenheit. The other has a temperature of 30 degrees Fahrenheit.
If you are trapped in either room for an extended period of time, you will probably die. Stick them next to each other with a door in between so you can cool off or warm up depending on what you need in the moment, and you’ll last a lot longer. Open the door and let the two rooms mix, and you’ll get a nice, survivable room temperature.
Butter and jam are hostile environments to bacteria, but they are different kinds of hostile environments, and mixing them together compromises that hostility.
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