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Natural Product Research
Formerly Natural Product Letters
Volume 33, 2019 - Issue 7: Natural Products in Cultural Heritage. Guest Editor: Luigi Campanella
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Research Articles

Application of microemulsions for the removal of synthetic resins from paintings on canvas

Sara GuizzoDepartment of Chemistry and Drug Technologies, Sapienza University of Rome, Roma, Italy
,
Cristina TortoliniDepartment of Chemistry and Drug Technologies, Sapienza University of Rome, Roma, Italy
,
Federico PepiDepartment of Chemistry and Drug Technologies, Sapienza University of Rome, Roma, ItalyORCID Iconhttp://orcid.org/0000-0001-6617-8192
ORCID Icon,
Francesca LeonelliDepartment of Environmental Biology, Sapienza University of Rome, Roma, Italy
,
Franco MazzeiDepartment of Chemistry and Drug Technologies, Sapienza University of Rome, Roma, Italy
,
Francesca Di TuroDepartment of Earth Sciences, Sapienza University of Rome, Roma, Italy
&
Gabriele FaveroDepartment of Chemistry and Drug Technologies, Sapienza University of Rome, Roma, ItalyCorrespondence[email protected]
ORCID Iconhttp://orcid.org/0000-0001-6650-7216
ORCID Icon show all
Pages 1015-1025 | Received 09 Feb 2016, Accepted 21 Sep 2016, Published online: 23 Oct 2016
 
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Abstract

Traditional cleaning methods with organic solvents often are not suitable for removal of aged resin so researchers have to find new formulations. In this work, a case study is reported in which new microemulsions were applied on the surface of a painting covered by some aged resin layers used during a previous restoration. Based on the quality of the intervention and the analysis of a sample of the varnish carried out with both MALDI-TOF and ATR-IR spectrometers, it was conjectured that this undesired material could be an acrylic polymer. So it was chosen to use xylene, ethyl acetate and propylene carbonate (XYL and EAPC) microemulsions (O/W oil in water). The first is able to solubilise only acrylic polymers, the second may solve both acrylic and vinyl resins. The first has had the greatest effect allowing complete varnish removal and original artwork restoration.

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