Papers and paper-based collections that were produced after the mid-nineteenth century, when increasingly complex manufacturing methods and additional materials had been introduced, often present sign of extreme degradation that are usually referred to as aging or can be said in photooxidation of cellulose occurred in the substrate (Schaeffer 2001, p. 56). ... Some components within the paper are prone to cause this problem if the paper is made from mechanical wood pulp or ground wood pulp instead of pure cotton fibers, for example, it is more likely to discolor or to cause photochemical react...

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