Why do recipes for cakes say store in an airtight container when there is air in the container anyway?
In: Other
Two reasons.
Firstly, it helps keep the cake from drying out. The air inside the container isn’t changing so it some of the moisture from the cake leeches out into the air, it’ll reach an equilibrium and stop losing moisture pretty quickly whereas the outside air is constantly changing and you don’t get as much protection.
Secondly, it reduces the chance of any contamination, especially from things like mold spores but also bugs and stuff.
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