Fig. 4From: Long-term corrosion of copper alloys in the soil: new aspects of corrosion morphology in archaeological vessels from south-western IranOptical and SEM-BSE micrographs of four samples of the M2 morphology with thick internal corrosion layers (A and B) and thick external corrosion layers (C and D). The limit of the original surface (OS) is obviously visibleBack to article page