Infrared photography technique commonly applied to a variety of techniques including aerial photography and art examination. False color infrared is preferred for vegetative and hydrologic studies. False color infrared film is sensitive to ultraviolet, visible and infrared radiation to approximately 900 nm. When the film is exposed with a yellow filter, the emulsion layers become sensitive to only green, red and infrared wavelengths. Blue radiation is absorbed by the filter; hence, the greater haze penetration ability of infrared film. In art conservation, the resulting false color images can be used as a noninvasive means of identifying the pigments that have been used in a painting or underdrawing.
