Infrared Reflectography

Infrared reflectography exploits the ability of infrared radiation to pass through most paint films down to the preparatory layers of the painting. If the preparatory layers are reflective to infrared radiation, then the camera can record the locations where the infrared light is absorbed. This technique is particularly useful to image certain pigments and underdrawings made using carbon-containing materials such as charcoal, graphite, or certain types of ink.

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