If you’ve ever seen a rainbow-like shine on slices of meat and wondered what it means, you’re not alone. Many people worry it signals spoilage or contamination, but the truth is much simpler and harmless.
That shimmering effect comes from how light interacts with the meat’s muscle fibers, fat, and iron. When light hits thinly sliced meat, it bends and splits into different colors, much like a rainbow in the sky. This happens especially when meat is cut across the grain, exposing more surface area, and when there’s moisture on the surface acting like a mirror.
Beef often shows this colorful effect, but it can also appear on pork, ham, bacon, and fish. The USDA confirms that this rainbow hue is natural and not a sign of danger.
Still, it’s wise to check meat for other freshness signs. A sour smell or slimy texture means it’s best to avoid eating it. Look out for odd colors like gray or green, which could mean spoilage.
When shopping, pick meat that looks bright and fresh. Avoid packages with torn seals or air bubbles in vacuum packs.
So, the next time your meat glows with a rainbow, don’t panic. It’s just light doing its thing. As long as the meat’s fresh, it’s safe and ready to cook.
