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The sgraffito in Križanke - interdisciplinary approach to the conservation-restoration of coloured historic plaster [Elektronski vir]
Gutman, Maja, 1984- ; Batič, Anka
Križanke Outdoor Theatre is a theatre in Ljubljana, Slovenia, used for summer festivals. Between 1952 and 1956, architect Jože Plečnik converted this former monastery into one of the city's most ...important cultural venues. To the left of the entrance to the courtyard is a small triumphal arch decorated with sgraffito. The conservation and restoration of the triumphal arch was carried out in the summer of 2021. During the investigation of the historical documentation and the first steps of surface cleaning, it was found that there had been an intervention in the past. Microscopic analysis revealed that a lime-cement mortar with aggregates consisting mainly of round carbonate grains had been used for the triumphal arch. The original and the reconstructed sgraffito plaster consisted of pigmented lime binder. The black pigment in the grey plaster was identified as carbon black. Pigments such as iron oxide (hematite) and iron hydroxide (goethite) with some carbon black are present in the red coloured plaster of the original sgraffito. Only hematite was used for the reconstructed red coloured sgraffito plaster. The mineralogical-petrographic composition of the aggregates in the two (original and reconstructed) sgraffito plasters is similar and consists mainly of carbonate grains. On the surface of the original sgraffito plaster there was a gypsum layer as a weathering product. The goal of this research was to study and characterise the plasters used in sgraffito decoration. The information was crucial for processes such as the development of repair plasters for the damaged parts.
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