Fig. 5From: The identification, approaches to cleaning and removal of a lead-rich salt crust from the surface of an 18th century oil paintingCross-section of sample BMRS4 #8 (blue sky) after removal of both varnish layers showing the blue paint layer; A Darkfield illumination; B UV radiation; C SEM-BSE image of the area marked by the black box in (A) and (B) which shows how the crust has a distinct morphology that is not as granular or integrated with the paint layerBack to article page