| Infrared light is part of the longer wavelength
portion of the electromagnetic spectrum beyond the red region of the visible
light spectrum. An ordinary camera using film sensitive to infrared light
produces an infrared photograph. Cameras with a tube or a solid-state detector
sensitive to infrared light are used in infrared reflectography; the resulting
image is an infrared reflectogram. Infrared light penetrates varnish and
paint layers, often revealing underdrawing or compositional changes beneath
the paint layer. |
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