Identification of green pigments and binders in late medieval painted wings from Norwegian churches

●Green pigments and binding media in three late medieval painted wings from Norwegian churches were investigated.●Paint presents lack of adhesion and delamination in many areas.●GC-MS derivatization methodology applied for the detection of metal soaps in paint samples. Green pigments in micro-sample...

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Bibliographic Details
Published in:Microchemical journal 2020-07, Vol.156, p.104811, Article 104811
Main Authors: Platania, Elena, Streeton, Noëlle L.W., Lluveras-Tenorio, Anna, Vila, Anna, Buti, David, Caruso, Francesco, Kutzke, Hartmut, Karlsson, Arne, Colombini, Maria Perla, Uggerud, Einar
Format: Article
Language:English
Subjects:
Binders
Copper-green pigments
Cross-sections
Late medieval
Metal soaps
Paint delamination
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Summary:●Green pigments and binding media in three late medieval painted wings from Norwegian churches were investigated.●Paint presents lack of adhesion and delamination in many areas.●GC-MS derivatization methodology applied for the detection of metal soaps in paint samples. Green pigments in micro-samples taken from three late-medieval painted objects from Norwegian churches have been investigated with the aim to characterize their constituents and understand how they relate to damages observed in passages containing green paints. The cross-sections were analyzed by optical microscopy under visible and UV light, Scanning Electron Microscopy coupled with Energy Dispersive X-Ray Spectrometry and vibrational spectroscopies (Raman, ATR-FTIR). In addition, Gas Chromatography coupled with Mass Spectrometry was employed for the characterization of binding media, using a derivatization methodology recently developed for the detection of metal soaps in paint samples. This extensive characterization aided the identification of the individual constituents and the stratigraphy of green paints. It also builds the foundation for future ageing studies that can provide better insights into the mechanisms of the processes at stake in selective delamination of paints containing copper complexes. [Display omitted]
ISSN:0026-265X
1095-9149
DOI:10.1016/j.microc.2020.104811