An exploratory study for the noninvasive detection of metal soaps in paintings through Optical Coherence Tomography

Vichi, A., Artesani, A., Cheung, C.S., Piccirillo, A., Comelli, D., Valentini, G., Poli, T., Nevin, A., Croveri, P. and Liang, H. ORCID: 0000-0001-9496-406X, 2019. An exploratory study for the noninvasive detection of metal soaps in paintings through Optical Coherence Tomography. In: H. Liang ORCID: 0000-0001-9496-406X and R. Groves, eds., Optics for Arts, Architecture, and Archaeology VII. SPIE Optical Metrology, Munich, Germany, 24-27 June 2019. SPIE proceedings (11058). SPIE.

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Abstract

The formation and growth of metal soaps is of interest in heritage science, as soaps have been linked to a range of alteration and degradation phenomena potentially affecting works of art. However, current approaches detect metal soaps mainly in an 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 morphological information of complex multi-layered systems, such as paintings, in a non-invasive way. In this work, the capability of detecting metal soaps with an 810 nm ultra-high resolution (UHR) OCT in a selection of real and mock-up samples has been explored with OCT virtual cross-section images complemented with invasive structural and chemical analysis (SEMEDX and ATR-FTIR spectroscopy and imaging). Although the visualization of metal soaps with OCT was evident in some samples, we also show that this is not always the case. In addition, the results of this work show that extra care is needed when interpreting OCT cross-section images to avoid the risk of misinterpreting features present in the paint stratigraphy.

Item Type:	Chapter in book
Creators:	Vichi, A., Artesani, A., Cheung, C.S., Piccirillo, A., Comelli, D., Valentini, G., Poli, T., Nevin, A., Croveri, P. and Liang, H.
Publisher:	SPIE
Date:	July 2019
Number:	11058
Identifiers:	Number Type 10.1117/12.2527569 DOI
Rights:	© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	06 Aug 2019 08:29
Last Modified:	07 Aug 2019 07:43
URI:	https://irep.ntu.ac.uk/id/eprint/37183

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