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?

9. Simple Kitchen Tests to Tell Optical Illusion from Spoilage

To distinguish harmless iridescence from spoilage:

1. Inspect visually for mold or abnormal discoloration.

2. Smell the meat for sour or off odors.

3. Check texture for sliminess.

If the pork passes these checks, the rainbow sheen is almost certainly an optical effect.

10. Tips to Reduce the Rainbow Effect

If you’d prefer to minimize the iridescent look:

• Slice against the grain at a steeper angle.

• Let the meat rest before slicing.

• Use a sharp knife for cleaner cuts.

These adjustments can reduce visible light diffraction without affecting flavor.

11. When in Doubt: Follow Basic Food Safety Rules

Always cook pork to an internal temperature of at least 145°F (63°C) with a three-minute rest. Practice good kitchen hygiene, wash hands and surfaces thoroughly, and refrigerate leftovers promptly.

If you are ever uncertain about the safety of meat, it is best to discard it. When it comes to food safety, caution is always the wiser choice.

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