*
Corresponding authors
a
Istituto Nanoscienze – Consiglio Nazionale delle Ricerche, NNL c/o distretto tecnologico, Lecce, via Arnesano 16, 73100 Lecce, Italy
E-mail:
gianluca.accorsi@nano.cnr.it
Tel: +39 0832 1816216
b
Istituto ISOF, Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy
E-mail:
gianluca.accorsi@isof.cnr.it
Tel: +39 051 6399816
c
The Courtauld Institute of Art, Somerset House, Strand, London, WC2R 0RN, UK
E-mail:
giovanni.verri@courtauld.ac.uk
Tel: +44 (0)2978482164
d
Dipartimento di Chimica “G.Ciamician”, Università di Bologna, Via F. Selmi 2, Bologna, Italy
E-mail:
francesco.zerbetto@unibo.it, angela.acocella3@unibo.it
e
Center for Biomolecular Nanotechnology (CBN), Fondazione Istituto Italiano di Tecnologia (IIT), Via Barsanti 1, Arnesano, Italy
f
Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, Campus Universitario, via Monteroni, 73100 Lecce, Italy
g
Department of Conservation and Scientific Research, British Museum, Great Russell Street, London WC1B 3DG, UK
h
Conservation Department, The National Gallery, Trafalgar Square, London WC2N 5DN, UK