: Is food safe to eat with grey or black residue on it? I noticed that every time I leave my food over night in my stainless steel caserole dish, there is this grey/black residue on it. I ate some of the food but after I saw

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Most likely the casserole dish is not stainless steel. If only because stainless steel is designed specifically not to chemically interact with the food, and will never discolor it.

That said, if it was my dish I'd get rid of it, or at least never let food sit in it longer than strictly necessary for cooking. Who know what you're ingesting, and most metals are toxic.