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The air in the environment contains moisture, which the crackers would absorb if they were not kept in an airtight tin. Keeping them in a tin prevents them from being exposed to a lot of moisture (there's still a little in the tin, but not nearly as much as their would be if the crackers were kept out in the open), hence they retain their crispness.

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Adah Doyle

Lvl 10
2y ago

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