Acid-free paper is
paper that has a neutral or
basic pH (7 or slightly greater). It addresses the problem of
preserving documents for long periods. Paper made from wood-based pulp that has not had its
lignin removed goes
yellow and deteriorates over time. When exposed to light and/or heat, the molecules in the wood-pulp (or acidic) paper will break down even faster. It was only in the 1930s that the effects of
wood-pulp paper became known, when
William Barrow (a librarian) published a report about the deterioration of acidic paper in our libraries. For fear of the gradual disintegration of written materials, measures have been taken to improve the quality of paper.
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