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Acid-free paper
Wikipedia article

http://en.wikipedia.org/wiki/Acid-free_paper

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Acid-free paper is paper that if infused in water yields a neutral or basic pH (7 or slightly greater). It can be made from any cellulose fiber as long as the active acid pulp is eliminated during processing. It is also lignin- and sulfur-free.[1] Acid-free paper addresses the problem of preserving documents and artwork for long periods.

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