You pull a slice of roast beef from the deli tray.
Sunlight hits it just right… and suddenly, your meat looks like it’s been dipped in oil or lit up with a disco ball.
Shades of emerald green, electric blue, and magenta shimmer across the surface.
Wait — is it bad?
Is it contaminated?
Did someone dye my lunch?
Relax.
That rainbow sheen on your meat isn’t a sign of spoilage or food fraud.
It’s called “diffraction” — and it’s nature’s way of turning muscle fibers into a prism. 💡
Let’s break down why this happens, when you should worry, and why your lunch isn’t secretly a unicorn. 🦄
🔬 What Causes the Rainbow Effect on Meat?
The colorful glow you see is structural color, not pigment — much like the iridescence on a butterfly wing or a soap bubble.
Here’s how it works:
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