1. Department of Chemistry and Industrial Chemistry University of Pisa Via Moruzzi 13 56126 Pisa Italy
2. CNR-Institute of Science and Chemical Technologies “Giulio Natta” (CNR-SCITEC) Via Elce di Sotto 8 01628 Perugia Italy
3. Department of Art Conservation University of Delaware 18 E. Main St. Rm 315 Newark USA