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What causes freezer burn?

How can I tell if meat has freezer burn?

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See this question for an example of freezer burn. – Caleb Feb 20 '12 at 1:23
up vote 15 down vote accepted

Freezer burn is just the food being dehydrated. Most meat will change color, and it becomes very obvious if you defrost it. It's not unsafe: just yucky.

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If it's just dehydrating it, why can't you just add water back in (eg. cook/soak it in liquid)? – Double AA Dec 9 '15 at 16:07

Leaving foods unwrapped or directly exposed to the air in your freezer/refridgerator will contribute greatly to freezer burn - try to put leftovers in containers or wrap them to ward against freezer burn :)

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