UNIQUE PRE‐ROMANESQUE MURALS IN KOSTOĽANY POD TRÍBEČOM,SLOVAKIA: THE PAINTING TECHNIQUE AND CAUSES OF DAMAGE |
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| Authors: | D HRADIL J HRADILOVÁ E KO?Í S ?VARCOVÁ P BEZDI?KA J MA?ÍKOVÁ‐KUBKOVÁ |
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| Institution: | 1. Institute of Inorganic Chemistry of the Academy of Sciences of the Czech Republic (ASCR), v.v.i., laboratory ALMA, 250 68 Husinec‐?e?, Czech Republic;2. Academy of Fine Arts in Prague, laboratory ALMA, U Akademie 4, 170 22 Praha 7, Czech Republic;3. Institute of Archaelogy of the Academy of Sciences of the Czech Republic (ASCR), Prague, v.v.i., Letenská 4, 118 01 Praha 1, Czech Republic |
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| Abstract: | Pre‐Romanesque murals at Kosto?any pod Tríbe?om, Slovakia, have been investigated by portable X‐ray fluorescence and by microanalytical methods to identify painting materials (pigments and binders), and to explain the degradation of colours. Today, missing green and blue shades have been reconstructed according to residual concentrations of Cu, which correspond to copper chlorides—products of salt corrosion of the copper carbonates azurite and/or malachite, accelerated by micro‐organisms. As confirmed by powder X‐ray microdiffraction, original minium (Pb3O4) has been transformed to brown–black plattnerite (PbO2). In increased humidity, even insoluble pigments are washing down from the walls and the intensity of colours further diminishes. |
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| Keywords: | PRE‐ROMANEQUE MURALS PAINTING MATERIALS ANALYSIS DEGRADATION OF PIGMENTS PORTABLE X‐RAY FLUORESCENCE X‐RAY MICRODIFFRACTION |
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