Fig. 4From: Microscopic observations of paper and parchment: the archaeology of small objectsSEM-BSD image (left) and EDX spectrum (right) of the bright mineral objects. a Modern A4 copy-paper sized with calcium carbonate from biomicrite or other fossil sedimentary rock, b Japanese paper made of mulberry fibres and containing calcium oxalates in the vessels, c Modern A4 copy-paper sized with calcium carbonate, after a fungal attack that tuned the carbonate into oxalateBack to article page