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For more, go to infrared photography.
Jim
Infrared Photography: Images of Unseen Color by evad
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 distinguish 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).
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