okay so i had this bag of M&M's in my room for about a month or so, and i didnt open in it. it was in one of those twisty bags like you get in the grocery store, so some air could get in. when i opened the bag, there was this white substance on the M&Ms. Not a lot, and it could be easily scratched off with my nail, but i was wondering what this substance is, and if its okay to eat ?
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