If your pork roast:
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Smells fresh
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Was stored properly
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Was cooked thoroughly
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Has no slimy or spoiled texture
Then that strange green or rainbow reflection is almost certainly just iridescence — a harmless optical effect caused by light interacting with muscle fibers.
It may look dramatic. It may resemble gasoline on water. But it does not automatically mean your meat went bad.
So before you toss that beautifully slow-cooked roast in the trash, check the basics.
Chances are, dinner is still perfectly fine — even if it’s putting on a little unexpected light show.