Grey Egg Whites

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Anonymous asked "I whipped egg whites in a Kitchen Aid mixer bowl & they turned a greyish color with a grey liquid. What kind of reaction was that? And is it still safe to eat? "

I can't be sure about a Kitchen Aid bowl but whipping egg whites in an aluminium bowl will produce a grey result as small particles of aluminium are rubbed off the bowl by the beaters.

Safe? Probably but best to avoid it if you can.
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