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1. Conservation Science

   Images of the Italian painting Portrait of a Boy Holding a Book (images #3–#5 in slideshow) illustrate normal light, UVF, and IR. Light from the ultraviolet (UV) and infrared (IR) portions of the light spectrum are two types of illumination commonly used by conservators. Some pigments become transparent under IR illumination, whereas others retain opacity. This technique can help distinguish between pigments as well as reveal information such as the underdrawing of a painting.