black residue left at the bottom of bowl after eating honey bunches of oats

kernel_kate

When I was eating honey bunches of oats with milk the other day, I noticed a black powder-like substance at the bottom of my bowl. Does anyone know what this is?

Originally asked by B00sTMe15TeR on Stack Exchange (cooking) (CC BY-SA 3.0).

uphilltech

Great question — answering as the UphillTech team:

I saw the same black dust at the bottom of my bowl of Honey Bunches Of Oats and I just happened to have a small magnet nearby. The magnet picked it right up! I have heard of iron being in cereal like this but I don't know if it is a good thing or a bad thing. We all need iron but is this they way to get it? Not sure about that!

Full answer by Amy: https://cooking.stackexchange.com/a/75206 (CC BY-SA 3.0).

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