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Friday, May 17 • 11:00am - 11:30am
(Paintings) New Approaches to Varnish Removal on Paintings: Non-Traditional Methods vs Solvents

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When varnish ageing affects the readability of a painting or the protecting powers of such varnish, interventions as cleaning or varnish removal are implemented. Although these procedures are commonly performed in conservation studios, they are quite dangerous, considering their irreversible nature. Traditionally, such procedures were carried out using organic solvent mixtures. However, beginning in the 1990s, the ongoing collaboration with scientists has led to new approaches developed for the cleaning of paintings and the removal of film-forming materials. Those new methods are not so widespread in conservation studios in Argentina. Therefore, their effectiveness and scope are not known, which is why conservators continue using solvents almost exclusively, unaware of the potential benefits of new techniques. The aim of this research is to compare the effectiveness of non-traditional methods for varnish removal with the use of traditionally-established solvents and to encourage the use of such new methods as well as interdisciplinary work in the country. Based on the current literature on the subject, different aqueous methods and emulsions were prepared to use as samples of non-traditional methods. As for traditional ones, increasing polarity tests were selected using hydrocarbon solutions of proven effectiveness. An experimental plan was designed to age mock ups of varnishes composed of different types of resins using an accelerated ageing chamber. The aim was to recreate the physical-chemical features of aged varnishes found in artworks. An empirical test was performed on each varnish using different methods. Through several techniques applied to artwork analysis, emulsions were found to be the most effective among non-traditional methods, notably polymeric, Pemulen TR-2-based emulsions, which proved highly successful, despite their low solvent percentage. Such effectiveness lies in the combination of water and solvents, allowing for the removal of resins which have become partially hydrophilic with ageing, using a lower solvent percentage and less polar solvents than those used with solvent-only removal. These new methods can not only provide a solution to the problem of toxicity risk associated with the use of organic solvents but also prove to be more selective in some cases, thus minimizing the risk to which the work is exposed. Varnish removal using non-traditional methods requires a deeper knowledge of the physical-chemical theory of processes involved, allowing for the development of specific mixtures tailored for each case, which is why ongoing interdisciplinary work with chemists contributing to the process is essential. This paper aims at bringing to the surface new varnish removal methods that can lead to the introduction of improved, more rational approaches in conservation studios in Argentina.

Speakers
avatar for Luciana Murcia

Luciana Murcia

Paintings Conservator, Cultural Heritage Recovery Coordination. Ministry of Treasury of Argentina.
As an art conservator specializing in paintings, Luciana has been working in different restoration studios and as an independent conservator in major museums in Buenos Aires, including the world-renowned Latin American Art Museum of Buenos Aires (MALBA) and the Buenos Aires Museum... Read More →

Co-Author
avatar for Marcela Lydia Cedrola

Marcela Lydia Cedrola

Bio-chemist/Conservation Scientist, National Chamber of Deputies of the Argentine National Congress
Marcela Cedrola Biochemist and Conservation Scientist. Head of the laboratory of scientific analysis applied to works of art at the laboratory of the Department of conservation and restoration of works of art of the National Chamber of Deputies, Buenos Aires, Argentina. University... Read More →


Friday May 17, 2019 11:00am - 11:30am
Salon B2, Uncas Ballroom
  • Track Paintings
  • Ticketed Included in Main Registration
  • Authors in Publication Order Luciana Murcia, Marcela Lydia Cedrola
  • Abstract ID 18707
  • Tags cleaning of paintings,varnish removal,solvents,polymeric emulsions,Pemulen.

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