I slow cooked a pork roast for 8 hours, but when I sliced it, I saw this weird shiny green and rainbow reflection on the meat fibers. It looks like gasoline on water. Did the meat go bad?

5. Red Flags That Mean Your Pork Roast Has Gone Bad

While iridescence is typically harmless, other signs may indicate spoilage:

• A sour, ammonia-like, or otherwise unpleasant smell

• A sticky or slimy surface texture

• Dull gray, greenish, or patchy discoloration

• Visible mold

If you notice any of these signs, discard the meat.

6. Smell, Texture, and Color Checks You Should Always Do

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