**3. Results**

Non-invasive analyses were carried out on the supposed unrestored parts of the north and east walls of Alexander and Roxane's wedding room in Villa Farnesina, both attributed to the painter Giovanni Antonio Bazzi, called Sodoma, and his workshop. Further analyses were also carried out on the third wall, the west one, of an unknown period and author in order to compare the results. The Tables 1–3 show the colors investigated and the main results for each employed technique. Not every color of the frescoes has been analyzed because a large part of the walls underwent heavy restorations, whose traces are also still sometimes visible in the investigated areas. Therefore, we limited our investigation to those supposed unrestored parts whose colors are shared by each of the three walls. The XRF analysis indicates Fe and Co as the most abundant elements. Fe, which often characterizes most of the pigments used for the fresco technique because of their stability and coverage, is found in red, orange, yellow, and purple areas. Cobalt is present instead as the main constituent of blue areas, widely used in all the walls studied both alone and in a mixture with other pigments.
