Műtárgyvédelem, 2012-2013 (Magyar Nemzeti Múzeum)
Antik és középkori padlómozaikok Magyarországon, készítéstechnikai megfigyelések és anyagvizsgálati eredmények tükrében
Kürtösi Brigitta Mária • Antik és középkori padlómozaikok Magyarországon stone occurring in the finds is vulcanite, as are the green-coloured Baláca tesserae. In the case of the Pécsvárad pieces, origins in the Mecsek Hills can be hypothesised: samples from the site proved identical with stone írom outcroppings of the Komló Andesite Formation from the Miocene period. In earlier publications, the black (dark grey) mosaic stones were consistently reported to be basalt, incorrectly on more than one occasion. Black tesserae from Aquincum, Nagyharsány, and Pécsvárad investigated by the author proved beyond doubt to be compacted limestone; on the other hand, the black Baláca stones were in fact vulcanite. The white, lime-based bedding mortar held the Baláca mosaics: by virtue of the fine filler material, it was not inclined to crack. This might indicate the presence of organic additives also. During microscopic examination of one fragment, a sample of this mortar yielded information regarding changes after the layer had hardened. Undulating light and dark bands could be detected under crossed-polarized light. These bands may be connected to the carbonation process (Liesegang phenomenon), through the size and distribution of the pores generated. Fundamental departures from Roman practice can be seen in the grounding and the grout layers of medieval mosaic floors. A szerző cime/Authors address: Kürtösi Brigitta Mária Festőrestaurátor művész/Painting conservator MA 2440 Százhalombatta, Bláthy Ottó utca 4. Tel.: +36-70-562-7674 E-mail: kurtosi.brigitta.maria@gmail.com Web: www.kurtosibrigitta.blogspot.hu 205
