Univerzita PardubiceFakulta restaurování

Univerzita Pardubice

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Publikace detail

Results of laboratory analysis of physical samples

Autoři: Lesniaková Petra | Zöldföldi Judit

Rok: 2025

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Results of laboratory analysis of physical samples	The contribution presents the results of a micro-invasive investigation of samples taken from the wall painting cycle located in the ambit of Emmaus Monastery in Prague. Sampling was conducted within the framework of interdisciplinary collaboration and systematically followed the findings obtained from the previous comprehensive non-invasive survey. The analyses of the collected samples focused on three key areas: (1) risks, including undesirable and potentially hazardous phenomena, (2) secondary interventions/additions, and (3) materials and techniques of the historical wall paintings. The samples were examined using microscopic methods combined with elemental and molecular analyses. The presence of pigments such as vine black, earth pigments, vermilion, minium, natural azurite, malachite, lead white, and calcium carbonate-based whites, particularly natural chalk, was confirmed in the historical paintings. It was further specified that the paintings were executed on chalk grounds, across more extensive areas than initially expected. The research further identified several deterioration phenomena and clarified existing assumptions regarding secondary materials. Among the most significant findings were the identification of darkened paintings with altered lead-based pigments overpainted during later interventions, contamination of paintings and plaster surfaces with sulphates and chlorides, and a more detailed characterization of secondary layers resulting from multiple applications of (synthetic) adhesives during restoration campaigns in the second half of the 20th century. These findings highlight the potential risks and hidden phenomena that must be carefully considered when planning the future conservation, securing and preservation of the wall paintings, and may thus contribute to a more precise formulation of their conception.	micro-invasive survey of paintings; scanning electron microscopy with energy-dispersive X-ray spectroscopy; pigment identification; medieval wall paintings; stratigraphy of paintings