Preserving originals

Restoration, book repairs and paper deacidification are the measures the Swiss National Library uses to preserve the original documents in its collections.

Repairing the spine of a book
© NL

Restoration and book repairs

Our conservation guidelines state that we focus on preventive measures for entire collections rather than restoring individual works. If necessary, originals are restored or repaired with minimal intervention. The aim is always to ensure that the works remain usable rather than to carry out a full restoration. Records are kept of all the work done. Partial restorations and simple repairs of damaged documents are performed in-house, whereas more complex restorations are handled externally.

Paper deacidification

Many papers from the period between 1850 and 1980 have a high acid content due to the production process and therefore become brittle over time. The acids are neutralised and rendered harmless with the help of paper deacidification, a mass treatment in large-scale technical facilities.

The NL had its acidic documents deacidified in the ‘papersave swiss’ plant in Wimmis near Spiez between 2000 and 2014. 1.2 million documents (483 tonnes, 13.7 linear kilometres) underwent this treatment, extending their life expectancy by at least a factor of four. In this way, the NL ensures the usability of the documents for future generations. The NL checks and documents the sustainability of this measure in a long-term monitoring programme.

More on paper deacidification

2016: Qualitätskontrolle bei der Massenentsäuerung: Erfahrungsbericht (PDF, 2 MB, 10.11.2016)

2006: Conference publication: Save Paper 2006 (PDF, 13 MB, 28.09.2006)

Further Reading

R. Altenhöner, A. Blüher, A. Mälck, E. Niggemann, A. Potthast, B. Schneider-Kempf: Eine Zukunft für saures Papier. Perspektiven von Archiven und Bibliotheken nach Abschluss des KUR-Projektes „Nachhaltigkeit der Massenentsäuerung von Bibliotheksgut“. Zeitschrift für Bibliothekswesen und Bibliographie, Sonderband 106, 2012.

J. W. Baty, C. L. Maitland, W. Minter, M. A. Hubbe and S. K. Jordan-Mowery:  Deacidification for the Conservation and Preservation of Paper-Based Works: A Review. BioResources 5(3) (2010): 1955-2023.
https://bioresources.cnr.ncsu.edu/BioRes_05/BioRes_05_3_1955_Baty_MMHJ_Deacidification_Conserv_Paper_Review_972.pdf

M. Ramin, H. Andres, A. Blüher, M. Reist, M. Wälchli: Paper Deacidification: Comparative Study. Journal of Paper Conservation 10 (2009): 17-25.

A. Blüher, G. Grossenbacher: La désacidification du papier, une mesure conservatoire: quatre ans d’exploitation à la Bibliothèque nationale suisse. Support Tracé n°4 (2004): 8-20.

A. Blüher, B. Vogelsanger: Mass Deacidification of Paper. Chimia 55 (2001): 21-28.

Last modification 24.11.2025