Abstracts - International Initiative for Georgian Cultural Studies
Abstracts - International Initiative for Georgian Cultural Studies Abstracts - International Initiative for Georgian Cultural Studies
RESTORATION/CONSERVATION Nicholas, Kintsvisi, the Church of the Mother of God, Timotesubani and the Church of the Virgin, Martvili – over the period 1996-2008. The projects have involved both Georgian and foreign experts from a variety of disciplines. Designing the treatments has involved following a series of general methodological issues applicable to conservation treatments in general, as well as a series of questions tied more particularly to Georgian works and to these projects in particular. For example budgetary constraints meant that treatments had to be highly prioritised to identify the most necessary treatments, though this was very much in accordance with a principal of minimal intervention favoured by all members of the teams. Problems of physical and chemical compatibility were also to the fore: for example, the fact that most of the paintings considered in the projects were not executed in buon fresco but rather using secco techniques meant that the use of aggressive cleaning agents was out of the question. Materials also had to be selected for their long term stability and evaluated against the possibility of their leading to further deterioration: for example, due to the risk of attack by microorganisms, it was decided not to use traditional fixatives such as casein to reattach flaking paint. Finally, in the most recent treatments the perhaps underappreciated problem of aesthetic presentation of the paintings has also been considered, in terms of the treatment of losses, which attempts to minimise disturbances to the viewer caused by damage to the images, while at the same time adhering to the principals of minimal treatment Nana Kuprashvili Tbilisi State Academy of Art. Georgia 12 th c Painting Techniques of the Main Church at Gelati Monastery Among the numerous murals of Gealti monastery the 12 th c frescos of the narthex, the south-eastern the southern porch and the north-western chapels are the earliest ones. The study of the painting in the narthex unveiled that the techniques in which the murals are executed is of a special interest. These painting belong to the minority of those medieval Georgian murals, which are executed in the mixed technique. The major component of the plaster of these murals is lime - the crucial factor while employing the mixed technique. The earth pigments are used for the preparatory drawing, whereas the painting uses the precious pigments such as ultramarine, cinnabar and red led. Chronologically, from the paintings survived in Gelati the first layer of the murals in south-eastern chapel comes next. T. Virsaladze dated these murals to 12 th c and considered them to be contemporaneous to the paintings of narthex. This layer is still visible from the existing painting in some places. This painting is also executed in the mixed technique. The fragments are survived on the level of preparatory drawing. The analyses of the painting of south-eastern chapel and those of narthex revealed that their plasters differ in terms of both - their content and thickness. The traces of another example of the early painting are observed in the southern porch, where the painting is almost vanished. The content of the plaster is similar to that of narthex. The plaster analyses give rise to the assumption that the narthex and southern porch were painted simultaneously in 12 th c., whereas the first layer of south-eastern chapel was applied slightly later. Among the earliest paintings of Gelati also are the three figures of Holy women survived on the level of the preparatory drawing on the southern wall of north-western chapel, which are also executed in mixed techniques. The preparatory drawing is applied in red ochre. The plaster analyses unveil the interesting fact that its plaster is similar to that of the first layer of the south-eastern chapel. 133
Giulia Caneva University Roma Tre. Italy Biodeterioration of Mural Paintings The biological attack of the mural paintings of the church of the Virgin in Martvilli was analysed, with a floristic and ecological approach. This problem was particularly relevant in the case of the western porch of the church, where diffuse growths of blackish, green and pink patinas, due to cyanobacteria (and other bacterial forms were detected. These biological colonisations were studied through optical microscopy and SEM, and differences between the different phenomenologies appeared mainly quantitative, with the exception of the pink ones. These latter seem, in fact, to referred to other bacterial forms, with carotenoid pigments, linked to high light input and lower values of humidity. In general, the changes in biodeterioration appeared to be correlated mainly to light and to the air circulation, especially the direction of humid air and fog during winter. Considering the porosity of the materials (mortars and stone) and the different environmental conditions in the porch, a map of the humidity level of the walls was carried out, using these organisms and their distribution as bioindicators. Some conservation treatments were carried out with preliminary tests of efficiency, using two biocides (Rocima 110 and Preventol R80, quaternary ammonium salts, in the first case plus an organotin compound) widely tested and used in the past. Through a microclimatic evaluation of the site, further interventions of environmental conditioning were also suggested, in order to limit the ecological ability of these organisms to grow, and solve this problem in a long lasting way. Thomas Warsheid LBW-Bioconsult. Germany Biodeterioration on Wall-Paintings The biodeteriorating effects of microorganisms on historical wall-paintings is based on a complex interaction between building physiscs (i.e. humidity, temperature, ventilation), the type of historical materials present (i.e. structure, thermal-hygric properties, nutritive effect) as well as the composition of the referring microflora and their metabolic activity. The deterioration of historical wall-paintings is basically determined by the porosity of the painted layer, the stability of their mineralic respectively organic matrix, the absorption of moisture and humidity, the load of soluble salts and the surrounding microclimatic conditions. Resulting damage processes are characterized by salt efflorescence, swelling and detaching pigment layers as well as disintegrating corrosion leading to powdering painting surfaces and the final loss of coherence of the wall paintings structure. The described damage forms are often accompanied by microbial impacts such as the biogenic enrichment of discolouring pigments (i.e. chlorophylls, melanins, carotinoids), the formation of moistureabsorbent, swelling and sticky biofilms, the penetration and mechanical stress by fungal hyphae, the enzymatic attack on organic substrates (i.e. historical binders, conservating consolidants) as well as the excretion of organic acids. Here, “Secco”-paintings are far more often victims of biodeterioration processes than “Fresco”-paintings since they offer a wider range of organic subtrates (i.e. starch, glue, casein, oil, egg yolk), but even anthropogenic influences can additionally support microbial deterioration processes by the increased deposition of organic fine dust as well as the application of polymer consolidants in the course of restoration treatments. Nevertheless the climatic conditions at site finally determine the extent of the potential microbial endargement. The complexity of biodeterioration impacts on wall-paintings will be discussed based on preliminary microbiological studies at the church of Ateni (Georgia) and related objects in Europe 134 RESTORATION/CONSERVATION
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RESTORATION/CONSERVATION<br />
Nicholas, Kintsvisi, the Church of the Mother of God, Timotesubani and the Church of the Virgin, Martvili<br />
– over the period 1996-2008.<br />
The projects have involved both <strong>Georgian</strong> and <strong>for</strong>eign experts from a variety of disciplines.<br />
Designing the treatments has involved following a series of general methodological issues applicable to<br />
conservation treatments in general, as well as a series of questions tied more particularly to <strong>Georgian</strong> works<br />
and to these projects in particular.<br />
For example budgetary constraints meant that treatments had to be highly prioritised to identify the<br />
most necessary treatments, though this was very much in accordance with a principal of minimal intervention<br />
favoured by all members of the teams.<br />
Problems of physical and chemical compatibility were also to the <strong>for</strong>e: <strong>for</strong> example, the fact that most of<br />
the paintings considered in the projects were not executed in buon fresco but rather using secco techniques<br />
meant that the use of aggressive cleaning agents was out of the question.<br />
Materials also had to be selected <strong>for</strong> their long term stability and evaluated against the possibility of their<br />
leading to further deterioration: <strong>for</strong> example, due to the risk of attack by microorganisms, it was decided<br />
not to use traditional fixatives such as casein to reattach flaking paint.<br />
Finally, in the most recent treatments the perhaps underappreciated problem of aesthetic presentation of<br />
the paintings has also been considered, in terms of the treatment of losses, which attempts to minimise disturbances<br />
to the viewer caused by damage to the images, while at the same time adhering to the principals<br />
of minimal treatment<br />
Nana Kuprashvili<br />
Tbilisi State Academy of Art. Georgia<br />
12 th c Painting Techniques of the Main Church at Gelati Monastery<br />
Among the numerous murals of Gealti monastery the 12 th c frescos of the narthex, the south-eastern the<br />
southern porch and the north-western chapels are the earliest ones.<br />
The study of the painting in the narthex unveiled that the techniques in which the murals are executed is<br />
of a special interest. These painting belong to the minority of those medieval <strong>Georgian</strong> murals, which are<br />
executed in the mixed technique. The major component of the plaster of these murals is lime - the crucial<br />
factor while employing the mixed technique. The earth pigments are used <strong>for</strong> the preparatory drawing,<br />
whereas the painting uses the precious pigments such as ultramarine, cinnabar and red led.<br />
Chronologically, from the paintings survived in Gelati the first layer of the murals in south-eastern chapel<br />
comes next. T. Virsaladze dated these murals to 12 th c and considered them to be contemporaneous to<br />
the paintings of narthex. This layer is still visible from the existing painting in some places.<br />
This painting is also executed in the mixed technique. The fragments are survived on the level of preparatory<br />
drawing.<br />
The analyses of the painting of south-eastern chapel and those of narthex revealed that their plasters<br />
differ in terms of both - their content and thickness.<br />
The traces of another example of the early painting are observed in the southern porch, where the painting<br />
is almost vanished. The content of the plaster is similar to that of narthex.<br />
The plaster analyses give rise to the assumption that the narthex and southern porch were painted simultaneously<br />
in 12 th c., whereas the first layer of south-eastern chapel was applied slightly later.<br />
Among the earliest paintings of Gelati also are the three figures of Holy women survived on the level<br />
of the preparatory drawing on the southern wall of north-western chapel, which are also executed in mixed<br />
techniques. The preparatory drawing is applied in red ochre. The plaster analyses unveil the interesting fact<br />
that its plaster is similar to that of the first layer of the south-eastern chapel.<br />
133