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Rock paper fungus: How X-ray imaging of rocks will save papers of the past

Believe it or not: X-ray works a lot better on rocks than on paper. This has been a problem for restorers trying to save historical books and letters from the ravages of time and fungi. They frankly did not know what they were up against once the tell-tale signs of vandals such as Dothidales or Pleosporales started to spot the surface of their priceless documents