Describe the external causes of deterioration of paper based materials.

The preservation and conservation of library materials, particularly paper-based items, is a crucial aspect of maintaining our cultural heritage. Paper, being a natural material, is susceptible to various forms of deterioration, many of which are exacerbated by external environmental factors. Understanding these external causes is essential for implementing effective preservation strategies.

1. Light Exposure:
One of the primary external causes of paper deterioration is exposure to light. Ultraviolet (UV) radiation, in particular, can cause significant damage. UV light accelerates the breakdown of cellulose fibers in paper, leading to weakening and yellowing. This process, known as photodegradation, reduces the longevity of paper ____ ___ ____ __________ ____ ___ ______ ____ _____ _____ ____ _____.
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