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Is reheating unpopped popcorn kernels foodsafe?
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I don't think there would be anything harmful if you tried, but it might just flat out not work. My understanding is that the kernels that end up not popping probably just aren't able to. There's a certain amount of moisture that needs to be inside the kernels in order for them to pop. If that moisture level isn't right then it won't go off. So the fact that they didn't already pop, probably means they can't.
I do this all of the time. You are partially right. You have to keep a close eye on it and stop popping earlier, otherwise they burn.