Fig. 1From: On-site monitoring of the performance of innovative treatments for marble conservation in architectural heritageState of conservation of Candoglia: a erosion and differential erosion in presence of stone heterogeneity (arrow indicates a quartz-siliceous vein); b eroded calcite grains and dark stripe-like biological colonization (digital microscope documentation); c black thick sulphatic deposit in an area sheltered by rainfall. State of conservation of Crevoladossola: d photographic documentation of a stone block showing the presence of areas with colour alteration [1] and surface recession [2] due to the erosive effect of the rainfall; e ESEM documentation of the altered stone surface with corroded grain boundaries and cleavage planes; f ESEM documentation of a polished cross-section with micro-cracks crossing the grains and partially filled with soil dust and particulate matter (indicated by the white arrow)Back to article page