Honey found in Egyptian royal tombs is still completely edible.

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Archaeologists working in the Valley of the Kings have uncovered sealed vessels of honey over three millennia old that remain thoroughly preserved and fit for human consumption. Honey owes its biological permanence to its low moisture content (under 18%), high natural acidity (pH around 3.9), and antimicrobial hydrogen peroxide produced when bees secrete the enzyme glucose oxidase during nectar processing.

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