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You could try popping it. Usually you can tell very quickly, because if the kernels are too old, they won't pop very well. For microwave popcorn, the kernels will remain at the bottom of the bag.

Popcorn has a shelf life of approximately two years. After this, it loses moisture and can become stale. It can also expire if the kernels are not stored properly. Popcorn dries out. The tiny bit of moisture inside the kernel is what causes it to pop. Without the moisture, the kernel remains.

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Q: How do you know if popcorn kernels have expired?
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