Fig. 8
From: Mapping of stones and their deterioration forms: the Clock Tower, Venice (Italy)
a SEM-BSE image of the black crust in sample 2S, and elemental distribution maps of b sulphur (S, pink), c chlorine (Cl, light blue), and d sodium (Na, yellow); e SEM-BSE images of sample 4N where discoloration phenomenon are displayed; f SEM-BSE images of sample 4S showing micro-cracks in the surface crystals; g SEM-BSE image of staining deposits in sample 2N, and elemental distribution map of h Cu (copper, yellow); i SEM-BSE image of past treatment residue in sample 1S, and elemental distribution map of j) F (fluorine, green)