Restorers used ultraviolet light to examine paintings by Giotto, who is credited as the first of the Renaissance masters, in the Peruzzi Chapel inside Florence's Santa Croce church. Centuries-old restorations have obscured the chiaroscuro effects and original details by the artist's hand. Under the UV light, Giotto's masterful work, as admired by Michelangelo in the 1500s, was visible to the restorers.

The scenes in the lives of John the Baptist and John the Evangelist, painted in about 1320, were evaluated for four months by restoration laboratory Opificio delle Pietre Dure, funded in part by the Getty Foundation, to determine the best course for restoration.