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1. Iridescent or Rainbow-Like Sheen
This is one of the most alarming-looking effects.
You slice into ham and suddenly see shimmering colors—greens, blues, even purples—reflecting off the surface.
It looks unnatural. Almost chemical.
But here’s the truth: it’s usually harmless.
This effect is caused by light reflecting off the muscle fibers and fat layers in the meat. When the surface is cut in a certain way, it can refract light much like a CD or soap bubble.
What to know:
It does not mean the ham is spoiled
It’s purely a visual effect
It’s more common in processed or sliced ham
If everything else seems normal—smell, texture, expiration date—you’re likely fine.