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Honey lasts because almost nothing can live in it. There is little water free for microbes, the sugar is high, and the acidity is unfriendly. Archaeologists have found jars of honey in ancient tombs that had not spoiled in any ordinary sense. Sweetness, here, is also a preservative. The jar is doing chemistry, not magic.

Honey keeps because it is a poor place for bacteria, not because it is enchanted.

The Science Behind Honey's Eternal Shelf Life · Smithsonian Magazine · 2013 · Factapp