Untersuchungen zum Einfluss von Restaurierungsmassnahmen fuer historische Glasmalereien auf das Korrosionsverhalten der Glasoberflaechen. T. 2 Projektphase 1992-1995

Selected restoration techniques for stained glass windows were compared with regard to their effectiveness and their damage potential. All investigations were carried out in the laboratory using model glasses which are sensitive to corrosion and which show similar corrosion phenomena as medieval glasses. The glass samples were cleaned in various test series in order to compare different 'dry' and 'wet' methods. The mechanical cleaning techniques were mainly carried out by restorers. As a result it became evident that the choice of an appropriate tool is almost as important as the way the restorer handles it. The interaction between chemical cleaning solutions and glass can be rather neglegible (as it is the case of organic solvents) or very damaging (e.g. if complexing agents or acids are used). After cleaning, the model glasses were examined mainly by light microscopy and IR-spectroscopy. The potential risk of cleaning techniques was estimated by examining the treated samples again after having been exposed to accelerated weathering. Investigations of cleaning techniques using model glasses provide a basis for selecting the most appropriate methods which, at a later stage, have to be tested on original glasses in close cooperation between scientists and restorers. (orig.)SIGLEAvailable from TIB Hannover: F96B1589+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman