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Restaurator, 1994. 15, 189-207 Printed in Denmark · All rights reserved Copyright © Munksgaard 1994 ASSY0034-5806 by J RGEN WITTEKIND The preservation of the cultural heritage available in the form of books and records is an important responsibility of libraries and archives. Worldwide the stocks comprise several hundred million volumes, and every year several shelf kilometres are added: predominantly of material printed or written on acidic paper. This makes it easy to appreciate the concern of librarians and archivists who have realized for a long time that their valuable and often unique collections are being destroyed by paper decay. A substantial part of the stocks has already been damaged to such an extent that it can no longer be used. The main cause of this paper decay is the acidity of the paper because of the method of production. This is particularly true for papers produced by industrial mass production methods, in other words, paper produced since about 1850. Chemical and physical examination of old paper demonstrates that, although pH values less than 4 and acidity in excess of 7000 mg per kg of paper -- mainly in the form of sulphuric acid - are not general, they
Restaurator - International Journal for the Preservation of Library and Archival Material – de Gruyter
Published: Jan 1, 1994
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