FunWhy are there cheeses with holes?

Why are there cheeses with holes?

The typical holes in cheeses, and especially Emmental, are the holes left by carbon dioxide bubbles when escaping in the last stages of ripening. This gas is released during lactic fermentation by propionic bacteria, so called because they also produce propionic acid, which helps to give cheese its taste. For this reason, when the cheese hardens, perfectly round holes remain inside, giving the cheese that typical and peculiar appearance.

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