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The pigments were identified in laboratory by light microscopy and some micro-chemical testing. In addition to that paint layers were analysed by FTIR-ATR to find traces of paint binders. No original binders were identified but all layers containing coloured pigment showed the presence of oxalaltes, which normally are considered to be the chemically transformed remains of organic binders. Multi spectral imaging (MSI) was used to identify materials in the wall painting areas and we tried to correlate the laboratory and on-site findings. MSI revealed the presence of Egyptian blue by its strong infrared fluorescence.
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This page is a summary of: Mainly red and a hidden blue – Laboratory and MSI investigations on the Carolingian wall paintings in the Chapel of the Holy Cross of Müstair (Switzerland), Journal of Cultural Heritage, March 2020, Elsevier,
DOI: 10.1016/j.culher.2019.07.024.
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