Experimental evidence of the thermally dominated effect of CW NIR laser irradiation for the restoration of darkened red lead in wall paintings

These XRD maps were collected on a stratigraphy of a wall painting mock-up containing plattnerite in animal glue after the treatment carried out with a CW 1064 nm laser to induce the transformation into red lead and assess the efficacy of the laser treatment (more details on the laser tratment can be found in the publication). The sample measured is a stratigraphy thin section of ca. 50 um thickness collected from the wall painting mockup. The difference between the 2 maps is the time of acquisition, with the PC-CW-2y standing for the same sample analysed after 2 years since laser irradiation to assess the stability of the treatment.