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AUTHOR INFORMATION

FRANCESCA CASADIO received her Ph.D. in chemistry from the Universit� degli Studi di Milano, Italy. She was graduate intern in the Science Department at the Getty Conservation Institute, Los Angeles, then research fellow at the ICVBC-CNR “Gino Bozza” in Milan. Since July 2003 she has been an A.W. Mellon conservation scientist at the Art Institute of Chicago. Address: Art Institute of Chicago, 111 South Michigan Ave., Chicago, Ill. 60603-6110; e-mail:fcasadio@artic.edu

LUCIA TONIOLO graduated with a degree in chemistry from Universit� degli Studi di Pisa. Since 1988 she has been a scientific researcher for the Italian National Research Council. Since 1998 she has been senior researcher of the Diagnostic Laboratory of the Centre “Gino Bozza” per lo studio delle cause di deperimento e dei metodi di conservazione delle opere d'arte, Milan. She has authored more than 100 publications in the field of stone materials conservation and pigment analysis. Address: ICVBCCNR Sezione di Milano “G. Bozza,” P. za L. Da Vinci 32, 20133 Milan, Italy; e-mail:lucia.toniolo@polimi.it