scientists. The meeting was characterised by presentations and discussions about recent advances, research results and perspectives, as well as open problems and incoming activities where new technological developments are required. The increasing importance of non-invasive diagnostic techniques was highlighted, by putting into evidence how they allow for getting information about problems related to very different fields. Just to give an example among the many, one (Calderón et al. 2020) deals to reveal techniques used by the artists in order to have a preliminary basis for conservation/restoration interventions, another is focused on tracking ancient people movements (Cattaneo et al. 2020). Presented works address various issues, presenting different diagnostic methodologies, some based on large scale facilities (Pronti et al. 2020), others exploiting mobile instrumentation (Domenici et al. 2020). The papers cover different historical periods on both continents which span from archaeological (Sario et al. 2020) up to modern era. The contributions are essentially concentrated on applied research and applications to CH. Most of the papers are based on detection of electromagnetic (E.M.) radiation and complementary techniques, including, but not limiting to, XRF/XRF-imaging (Kriznar et al. 2020), XRF (Dabagov et al. 2020), SEM (Bruni et al. 2020), γ-rays transmission (Cesareo et al. 2020). Given the importance of this field for the community, a session was also dedicated to the interpretation of the detector response function of E.M. radiations. Innovative techniques and experimental setups have been proposed and tested. In the presented papers, the interdisciplinary approach is strong, as shown by the many cases where X-ray based techniques are integrated by other techniques, such as, for example, FT-IR, multispectral techniques (visible, UV, IRR) and Raman microscopy (Palamarczuk et al. 2020;Pronti et al. 2020;Martín and Nuevo 2020;Domenici et al. 2020). A new approach to implement effective low-cost, multiparameter conservation strategies in museums and artwork repositories has been presented, of great interest because it opens up the way to economically affordable, customized solutions suitable for all sites (Marcelli et al. 2020).
