Français : Schéma illustrant le fonctionnement de la réflectographie infrarouge. Le rayonnement visible par l'oeil humain ne traverse pas les pigments de peinture, contrairement au rayonnement infrarouge. Ainsi, les caméras capables de capter le rayonnement infrarouge nous permettent de visualiser ce qui se cache sous les pigments de peinture d'un tableau.
English: This picture shows how the infrared light is used to uncover the underdrawings lying beneath the color pigments of a painting. The human eye cannot see through the pigments because they block the visible light. As the infrared light goes through, it can reveal what lies beneath, thanks to an infrared camera.
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