Sliced up the roast beef I cooked in the oven yesterday and there’s a weird shiny rainbow shimmer on the cut surface. It looks metallic or like oil. Is this spoiled or safe to eat?

As long as the meat has been stored properly and shows no other signs of spoilage, such as an off smell or discoloration, the iridescence is just a natural characteristic of the meat’s structure. It doesn’t indicate any chemical additives or spoilage; it’s purely a physical phenomenon.

4. Visual Red Flags: Signs the Beef Actually Is Spoiled

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