https://orcid.org/0000-0003-2648-8510
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ABSTRACT
With the occasion of the exhibition Fatti come nuovi (20 October 1985–12 January 1986), where the most prominent artworks of the Poldi Pezzoli Museum in Milan were shown after restoration, a multidisciplinary project was launched between the Museum and the Italian Montedison group. This project aimed at evaluating several conservation products used at the time in ceramic and glass conservation, such as adhesives and retouching varnishes. In the frame of the project, two-component epoxy adhesives (Plastogen® EP, HXTAL NYL-1), acrylates (Paraloid® B-72, Plastogen® G), vinyl acetate dispersions (Vinavil®, Arkolyn), a polyester resin and cellulose nitrate adhesives (HMG, AGO® Goldsiegel) were studied in terms of their mechanical properties and colour change upon artificial ageing by UV-VIS radiation. Since then, the samples were kept in the dark. Almost 30 years later, the samples have been re-evaluated for changes in solubility and colour upon natural ageing.
Acknowledgements
The preparation and the evaluation of the samples 1984–1986 was conducted in the research center LARAC S.p.A. in Castellanza (Montedison, Italy) by Diego Venchiarutti, Giorgio Pin, Franco Gulani, and Vincenzo Massa. The authors are indebted to Jorge Chamón, Cristian Mazzon, and Isabella del Gaudio for reviewing the manuscript and visual evaluation of the samples in 2015. The authors would especially like to thank the University of Applied Science Potsdam for the use of the ATR-FTIR spectrometer. The 2012 analyses presented in this work were carried out in the Rathgen Research Laboratory of the National Museums Berlin, which is here gratefully acknowledged.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Notes
1 HXTAL Adhesive, LLC., revision date 11/10/10; a most recent document can be downloaded from https://www.msdsdigital.com/hxtal-nyl-1-epoxy-adhesive-part-resin-part-b-hardener-msds (Accessed September 9, 2021).
2 It should be kept in mind that the composition of this sample is not necessarily the same as that of the original samples of 1984.
3 Röhm and Haas.
4 In 2015, all samples were visually examined separately by four different people; of all the samples in this study, only N80a and N80b showed a distinct yellow hue.