Depiction of passing infrared radiation

Imaging using passing infrared radiation is a technique used by few laboratories internationally, and it is a pioneering research tool used by the Physicochemical Research Laboratory of the National Gallery. It can provide valuable information during the study of cloth support paintings, and lead to the detection of underdrawings, changes in the composition of the painting (pentimenti), and reveal the state of conservation of cloth support paintings. To apply the infrared examination technique, one of the light sources is positioned at a safe distance behind the work and positioned so that the light is confined to the cloth support. The infrared camera is positioned in front of the work, in the same position used during normal photography or during Infrared Reflectography.

  • Π.2640 Theophrastos Triantafyllidis "For the Grape Harvest (From the Life of the Gypsies)"

    The passing infrared radiation revealed a complete underpainting, a composition comprising of three male figures and other components, e.g. a glass, created along with a preliminary sketch.

  • P. 258 G.F. Watts "Hope" - detail

    The passing infrared captured a very detailed, spontaneous, preliminary sketch.

  • P.1108 I. Rizou "Athenian night" - detail

    In this case, the infrared radiation revealed changes in the figures of the final painting, and shows that the artist had originally "set up" the head of the man to be of a larger dimension.

  • P.1108 I. Rizou "Athenian night" - detail

    Visible radiation revealed that the depth of the cracks extends to the ground layer, which is why visible radiation is the most often used technique for analyzing such problems. The image was also examined with infrared radiation in order to fully examine the scope of the damage.

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