An exploratory study for the non-invasive detection of metal soaps in paintings through optical coherence tomography

摘要

The formation and growth of metal soaps is of interest in heritage science, as soaps have been linked to a range of alterationand degradation phenomena potentially affecting works of art. However, current approaches detect metal soaps mainly inan invasive way or only at a late formation stage when the metal soaps are formed on the surface of the artwork. In contrast,Optical Coherence Tomography (OCT) has been proven to be a very suitable tool to obtain subsurface morphologicalinformation of complex multi-layered systems, such as paintings, in a non-invasive way. In this work, the capability ofdetecting metal soaps with an 810 nm ultra-high resolution (UHR) OCT in a selection of real and mock-up samples hasbeen explored with OCT virtual cross-section images complemented with invasive structural and chemical analysis (SEMEDXand ATR-FTIR spectroscopy and imaging). Although the visualization of metal soaps with OCT was evident in somesamples, we also show that this is not always the case. In addition, the results of this work show that extra care is neededwhen interpreting OCT cross-section images to avoid the risk of misinterpreting features present in the paint stratigraphy.