A molecular study of modern oil paintings: investigating the role of dicarboxylic acids in the water sensitivity of modern oil paints
Open Access
- 6 February 2018
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in RSC Advances
- Vol. 8 (11), 6001-6012
- https://doi.org/10.1039/c7ra13364b
Abstract
The 20th century has seen a significant evolution in artists' paint formulation and technology which is likely to relate to the new conservation challenges frequently presented by modern oil paintings, including unpredictable water- and solvent-sensitivity. This study examined the molecular causes and mechanisms behind these types of modern oil paint vulnerability. Research performed up to now has suggested a correlation between the occurrence of water sensitivity and the presence of relatively high amounts of extractable free dicarboxylic acids. To explore this further, as well as the influence of paint formulation, a set of model paint samples, produced in 2006 using commercial tube paints to which known amounts of additives were added, were analysed. The samples were tested for water sensitivity by aqueous swabbing and characterised using transmission Fourier Transform-Infra Red spectroscopy (FTIR) to determine the molecular composition of the main paint constituents, High Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS), to identify the type(s) of drying oils used as binders, and Gas Chromatography-Mass Spectrometry (GC-MS) using a recently developed analytical procedure that can discriminate and quantify free fatty and dicarboxylic acids, as well as their corresponding metal soaps (carboxylates of fatty and dicarboxylic acids). The results indicated that the addition of small amounts of additives can influence the water sensitivity of an oil paint, as well as its molecular composition. Additionally the nature of the ionomeric/polymeric network appears to be a significant determining factor in the development of water sensitivity.This publication has 25 references indexed in Scilit:
- A cause of water-sensitivity in modern oil paint films: The formation of magnesium sulphateStudies in Conservation, 2014
- Acrylic emulsion paint films: The effect of solution pH, conductivity, and ionic strength on film swelling and surfactant removalStudies in Conservation, 2014
- Non-invasive identification of metal-oxalate complexes on polychrome artwork surfaces by reflection mid-infrared spectroscopySpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2013
- Alkyd paints in art: Characterization using integrated mass spectrometryAnalytica Chimica Acta, 2013
- Core shell stationary phases for a novel separation of triglycerides in plant oils by high performance liquid chromatography with electrospray-quadrupole-time of flight mass spectrometerJournal of Chromatography A, 2013
- New Insights into the Ageing of Linseed Oil Paint Binder: A Qualitative and Quantitative Analytical StudyPLOS ONE, 2012
- A Nineteenth-Century Colourman's TerminologyStudies in Conservation, 2009
- Kinetics of oil saponification by lead salts in ancient preparations of pharmaceutical lead plasters and painting lead mediumsTalanta, 2006
- The Changing Mechanical Properties of Aging Oil PaintsMRS Proceedings, 2004
- A vibrational spectroscopic study of cobalt(II) oxalate dihydrate and the dipotassium bisoxalatocobalt(II) complexJournal of Molecular Structure, 1992