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UNIQUE PRE‐ROMANESQUE MURALS IN KOSTOĽANY POD TRÍBEČOM, SLOVAKIA: THE PAINTING TECHNIQUE AND CAUSES OF DAMAGE
Author(s) -
HRADIL D.,
HRADILOVÁ J.,
KOČÍ E.,
ŠVARCOVÁ S.,
BEZDIČKA P.,
MAŘÍKOVÁKUBKOVÁ J.
Publication year - 2013
Publication title -
archaeometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 67
eISSN - 1475-4754
pISSN - 0003-813X
DOI - 10.1111/j.1475-4754.2012.00704.x
Subject(s) - malachite , painting , copper , pigment , brass , art , mineralogy , chemistry , materials science , metallurgy , art history , visual arts
Pre‐Romanesque murals at Kostoľany pod Tríbečom, 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 (Pb 3 O 4 ) has been transformed to brown–black plattnerite (PbO 2 ). In increased humidity, even insoluble pigments are washing down from the walls and the intensity of colours further diminishes.