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After frying foods, for example, chicken or cutlets(mix of meat and potato) with frying sunflower oil, the oil turns green/greenish, is this oil spoiled and bad? Shouldn't I use the rest of the oil bottle? (I mean oil that has not been used yet.) The following photos are of when the oil is cooled.

Thank you

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Is this can be related to my problem?

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Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10048579/

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    Welcome to SA! The oil doesn't look green to me in the photo. Is it greener than that in person?
    – FuzzyChef
    Commented Apr 29 at 18:06
  • @FuzzyChef Thank you, No, the oil looks the same.
    – Hadi
    Commented Apr 29 at 18:10

1 Answer 1

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That oil just looks dirty to me. I wouldn't re-use it, but I don't see any visual indication that there's anything wrong with it.

It is normal for oil to turn dark with use, and darkening is a sign that the oil is no longer reusable and should be thrown away or recycled.

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    Sunflower oil in particular is known to turn green in the presence of bases, apparently Commented Apr 30 at 0:05
  • @fyrepenguin that sounds like an answer! Why don't you post it as one?
    – FuzzyChef
    Commented Apr 30 at 5:08
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    I figured it could be relevant, in that sunflower oil can turn green in some situations, but it’s not clear to me that it’s the case here. But I had vaguely recalled seeing someone mention their sunflower oil cookies turning green after baking them Commented Apr 30 at 7:56
  • @fyrepenguin and FuzzyChef I edited my question and added details. Please see: Is this can be related to my problem?
    – Hadi
    Commented May 4 at 23:20

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