Razvoj novega postopka stabiliziranja korozivnega zelenega bakrovega pigmenta na papirju
Malešič, Jasna ...
The focus of the research was the stabilisation of paper with green copper pigment verdigris. Due to its corrosive effect on paper, many important documents, paintings and maps are in danger. The ...efficiency of several commercially available deacidification agents on paper samples with verdigris were tested, including the magnesium-based Bookkeeper dispersion, nano-calcium hydroxide containing Nanorestore and Calosil dispersions as well as a dispersion of nano-calcium carbonate. Antioxidant tetrabutylammonium bromide was tested either alone or in combination with nano-calcium carbonate. The effects of the treatments were evaluated using colour, tensile strength, degree-of-polymerization and pH measurements. The method described, which involves the use of antioxidant tetrabutylammonium bromide in combination with calcium carbonate-based deacidification dispersion, was proved to have a superior effect against degradation of paper with verdigris in comparison to the treatments that contain only deacidificatio agents.
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