The members of the advisory group during a visit at the Opificio delle Pietre Dure e Laboratori di Restauro, Firenze. Photo: Foekje Boersma

Visit of the advisory group and several of the project team members to the paintings conservation studio of the Metropolitan Museum of Art in New York, where they are shown around by George Bisacca. Photo: Foekje Boersma

Visit of the advisory group and several of the project team members to the Opificio delle Pietre Dure e Laboratori di Restauro, Firenze, Settore Dipinti Mobili, where they are shown around by Marco Ciatti. The group discusses structural conservation issues of the panel painting Madonna col Bambino by Cimabue, Castelfiorentino (Firenze), Museo di Santa Verdiana. Photo: Foekje Boersma

Visit of the advisory group and several of the project team members to the Opificio delle Pietre Dure e Laboratori di Restauro, Firenze, Settore Dipinti Mobili. The group discusses the x-ray photo of the Angelico, Tabernacolo dei Linaioli, Firenze, Museo di San Marco. Photo: Foekje Boersma

Conservators at the Opificio delle Pietre Dure e Laboratori di Restauro, Firenze, Settore Dipinti Mobili, working on the conservation of Giotto's Croce dipinta, Firenze, Chiesa di Ognissanti. Photo: Foekje Boersma

Woodworking tools at the Opificio delle Pietre Dure e Laboratori di Restauro, Firenze, Settore Dipinti Mobili. Photo: Foekje Boersma

Members of the advisory group discussing a structural support system for panel paintings at the Opificio delle Pietre Dure e Laboratori di Restauro, Firenze, Settore Dipinti Mobili. Photo: Foekje Boersma

The reverse of the panel painting 'Lady Playing a Lute' by Bartolomeo Veneto and Workshop, about 1530 from The J. Paul Getty Museum

Conservator George Bisacca of the Metropolitan Museum of Art, New York, demonstrating structural treatment at the Getty Center on the Crucifixion by Albrecht Altdorfer from the collection of the Szépmüvészet Múzeum, Budapest. Photo: Mark Leonard, Getty Museum

George Bisacca at the Getty Center removing the cradle from the reverse of the panel painting Madonna and Child attributed to Giovanni Antonio Boltraffio from the collection of the Szépmüvészet Múzeum, Budapest. Photo: Sue Ann Chui, Getty Museum