Acid-free paper
Type of paper used for preservation / From Wikipedia, the free encyclopedia
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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 preserving artwork for long periods.