The Characterization of Microenvironments and the Degradation of Archival Records

Passaglia, Elio

doi:10.1515/rest.1989.10.3-4.123

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1989

DOI: 10.1515/rest.1989.10.3-4.123

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The Characterization of Microenvironments and the Degradation of Archival Records

Elio Passaglia¹

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1997

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“…Passaglia 17 used mathematical modelling to study the protective mechanisms provided by storage containers but reached no conclusions regarding the interaction of the external environment with paper in a book. Shahani 3 reported that when temperature and relative humidity are cycled, the relative humidity within books does not change significantly.…”

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confidence: 99%

Properties of Paper in Naturally Aged Books

Brandis¹,

Lyall²

1997

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INTRODUCTIONAn examination of eighteen books, naturally aged for more than one hundred years has been carried out to investigate the effects of natural aging on the paper. The purpose of the study was to determine if there was any relationship between the properties of papers in books which had been artificially aged and those which had been naturally aged. In addition it was hoped that this study might provide some evidence which would assist in drawing comparisons between the microenvironments created within books and those within books which have been shrink wrapped.In 1980, chemists at the Research and Testing Office at the Library of Congress undertook a study comparing the deterioration of papers under accelerated aging conditions, 90° C and 50% relative humidity, with and without shrinkwrapping 1 . Two books were tested: one half of each was shrink wrapped and the other unwrapped. After aging, the paper was tested for pH, acid content, brightness and folding endurance. From the results, they concluded that shrink wrapping significantly increased the rate of degradation of paper. The chemists left it to custodians and conservators to decide whether the physical protection afforded by the shrink wrapping would compensate for any possible increased rate of deterioration.Researchers at the National Archives and Records Administration, Washington, recently investigated the effect of shrink wrapping on simulated bound volumes 2 . Four volumes were made using 50 sheets of new paper and old bindings. Each volume was cut in half; one half was artificially aged as is; the other was shrink wrapped and then aged. Aging conditions were 70 °C and 65% relative humidity. The brightness, folding endurance, pH and viscosity of paper in each half book was measured. Apart from brightness, the results showed little difference between how paper in the wrapped and unwrapped books aged. The researchers found that the brightness of paper in the wrapped bindings decreased more than die paper in the unwrapped volumes. Testing was performed on the first six pages, the last six and the middle twelve papers. Position was found to have a small but Restaurator 1H: 11.5-130 © 1997 Saur, Munich etc. 7 75 Brought to you by | University of Arizona Authenticated Download Date | 7/6/15 9:43 AM

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mentioning

confidence: 99%

Properties of Paper in Naturally Aged Books

Brandis¹,

Lyall²

1997

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The Characterization of Microenvironments and the Degradation of Archival Records

Cited by 1 publication

References 7 publications

Properties of Paper in Naturally Aged Books

Properties of Paper in Naturally Aged Books

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