Characterisation of foxing stains in eighteenth to nineteenth century drawings using non-destructive techniques
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The reddish-brown, brown or yellowish stains of circular or irregular shape known as foxing spots have been fully described in conservation literature but still, this phenomenon does not find any scientific agreement since many hypotheses have been raised concerning their origin. In this work a contribution to foxing definition not only focussed on its appearance but also reported on its chemical information. For this purpose foxing stains present in drawings from two Portuguese artists dated from the eighteenth to nineteenth centuries were observed under ultra-violet light and optical microscope and analysed by three non-invasive spectroscopy techniques. The observations carried out on the stains provided information on their surface morphology. The use of energy-dispersive X-ray fluorescence revealed a variation on the elemental content between foxing and paper region. Although the results from X-ray diffraction analysis showed no signs of cellulose degradation in foxing stains, Fourier-transformed infrared analysis revealed the presence of oxide groups. Both the information on the chemical nature and surface morphology of the stains achieved in this study will contribute to increase foxing formation information and develop future protocols for conservation purposes.
KeywordsFoxing EDXRF XRD FTIR Morphological characterisation
This work was funded by the Portuguese Foundation for Science and Technology FCT-SFRH/BD/30259/2006 and PTDC/71998/2006 (Morphological characterisation of paper stains and treatment methodologies).
- 1.Derow J, Owen A (1992) In: Paper conservation catalog, American Institute for Conservation Book and Paper Group, Foxing, Washington, D.C.: AIC. Chap.13:1–39Google Scholar
- 2.Choi S (2007) Foxing on paper: a literature review. J Am Inst Conserv 46:37–152Google Scholar
- 3.Ligterink FJ, Porck HJ, Smith WJ Th (1991) Foxing stains and discolouration of leaf margins and paper surrounding printing ink: elements of a complex phenomenon in books. The Paper Conservator, IPC, 15:45–52Google Scholar
- 6.Bicchieri M, Ronconi S, Romano FP, Pappalardo L, Corsi M, Cristoforetti G, Legnaioli S, Palleschi V, Salvetti A, Tognoni E (2002) Study of foxing stains on paper by chemical methods, infrared spectroscopy, micro-X-ray fluorescence spectrometry and laser induced breakdown spectroscopy. Spectr Acta B 57:1235–1249CrossRefGoogle Scholar
- 13.Pedersoli JL, Ligterink FJ, van Bommel M (2001) Investigation into fluorescence changes accompanying paper discoloration. In: ICOM—CC's Interim meeting of the working group on graphic documents at EVTEK Institute of Art and Design, pp. 7–10. Vantaa (Helsinki), FinlandGoogle Scholar
- 14.Pessanha S, Manso M, Guilherme A, Costa M, Carvalho ML (2009) Investigation on historical documents for forensic purposes by X ray fluorescence analysis. Surface and Interface Analysis doi: 10.1002/sia.3085