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"In infrared photography, the film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinquish it from far-infrared, which is the domain of thermal imaging.

Wavelengths used for photography range from about 700 nm to about 900 nm.

Usually an "infrared filter" is used; this lets infrared (IR) light pass through to the camera but blocks all or most of the visible light spectrum (and thus looks black or deep red)."

- Source: Wikipedia.