Ultraviolet light allows us to detect relatively recent restoration, which (for a restorer/in restoration terms) may be a hundred years old. With UV rays, the restorations appear as opaque patches. Infrared reflectography allows us to detect restorations that are not necessarily detectable with UV light, as they are too old. Infrared also allows us to see preparatory drawings, hidden inscriptions, or modifications to the composition. The infrared reflectography camera is advantageous because the result of the observation is immediately visible on the video screen, which is not the case with photography. While infrared reflectography is used for analyzing the upper layers of an artwork, radiography allows us to study all layers.
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