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  • Stabilisation treatments for paper with green copper pigment Verdigris
    Malešič, Jasna ...
    The focus of the research is stabilization of paper with green copper pigment Verdigris. Due to its corrosive effects on paper, many important documents, paintings and maps are in danger. The ... efficiency of several commercially available deacidification agents on paper samples with Verdigris was tested, including magnesium-based Bookkeeper dispersion, nano calcium hydroxide containing Nanorestore and Calosil dispersions as well as recently developed dispersion of nano calcium carbonate. Antioxidant tetrabutylammonium bromide was tested either alone or in combination with nano calcium based deacidification agents. The effect of the treatments was evaluated using colour, tensile strength, degree of polymerization and pH measurements. The results indicate that acidic degradation does not play a major role during accelerated degradation of paper containing Verdigris with moderately acidic pH value and that oxidative decay could be the main culprit of the decay. The method described, which involves the use of antioxidant tetrabutylammonium bromide in combination with calcium carbonate based deacidification dispersion, was proved to have superior effect against degradation of paper with Verdigris in comparison to the treatments, which contain deacidification agents only. Nano calcium hydroxide based deacidification agents result in high pH values of the paper samples and therefore could not be advised for use on paper documents.
    Source: Restaurator : international journal for the preservation of library and archival materials. - ISSN 0034-5806 (Vol. 41, iss. 4, nov. 2020, str. 231-251)
    Type of material - article, component part ; adult, serious
    Publish date - 2020
    Language - english
    COBISS.SI-ID - 20590339
    DOI

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