Fluorination technique to identify the type of resin in aged vanishes and lacquers using infrared spectroscopy

Zumbühl, Stefan; Hochuli, Andreas; Soulier, Jacques Balthazar; Scherrer, Nadim (2017). Fluorination technique to identify the type of resin in aged vanishes and lacquers using infrared spectroscopy Microchemical Journal, 134, pp. 317-326. 10.1016/j.microc.2017.06.013

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Infrared spectroscopy (FTIR) is a standard technique for the characterisation of organic materials in conservation science. This analytical technique is particularly interesting to analyse historical varnishes from cultural artefacts, as only minute samples are required. Some limitations apply, however, when analysing such chemically complex multi-component materials with interfering absorption bands. A previously introduced sample pre-treatment method using gaseous sulfur tetrafluoride sF(4) has shown to widen the application fields of the IR-technique by improving its specificity. One of these new fields is its successful application to the characterisation of complex aged natural varnish and lacquer systems. The fluorination treatment leads to characteristic band shifts of four individual saturated and unsaturated acid groups attached at varying positions of the terpene backbone. This allows the separation of otherwise overlapping carbonyl bands of different ketones and ester groups. Based on this technique, inert and unique functional groups can be used as material specific markers to identify drying oil, shellac and different terpene resins in varnishes and lacquers. The proposed markers proved to be stable for several hundred years. These findings are particularly interesting, as it is now possible to trace such markers even in very old varnishes dating back to the 16th century - with a likewise simple technique. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:

Journal Article (Original Article)

Division/Institute:

Bern University of the Arts > Fachbereich Konservierung und Restaurierung
Bern University of the Arts
Bern University of the Arts > Fachbereich Konservierung und Restaurierung > Kunsttechnologisches Labor

Name:

Zumbühl, Stefan; Hochuli, Andreas; Soulier, Jacques Balthazar and Scherrer, Nadim

Subjects:

N Fine Arts > ND Painting

ISSN:

0026-265X

Language:

English

Submitter:

Nadim Scherrer

Date Deposited:

18 Feb 2020 07:43

Last Modified:

13 Jul 2020 08:46

Publisher DOI:

10.1016/j.microc.2017.06.013

Related URLs:

Web of Science ID:

000407188300044

Additional Information:

Notes: Fc9vd Times Cited:0 Cited References Count:41 Date: 2017

Uncontrolled Keywords:

infrared spectroscopy sulfur tetrafluoride signal discrimination varnish music instrument art technology assisted laser desorption/ionization varnishes identification acids

ARBOR DOI:

10.24451/arbor.8049

URI:

https://arbor.bfh.ch/id/eprint/8049

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