Egyptian and Graeco-Roman wall plasters and mortars : a comparative scientific study
The development of methods of examination and analysis for painted plaster allows us to identify and determine not only the original materials used, but also to define the causes of subsequent alteration, which has affected both the painted layers and the rendering. The aim of this research is to examine and analyse wall plasters and mortars from different sites and periods, in order to identify composition, structure and mineral content, and to define the main forms of deterioration and decay affecting the wall paintings. The strategy of examination of these materials is divided into three stages with the following analytical methods. 1-Preliminary analysis: In the initial examination a microscope was used at 10X magnification and to look at polished cross-sections, to identify the structure of the mortar and the painted layers. 2-Chemical and micro-chemical analysis: Microanalysis (spot tests). Standard methods were used to identify the quantitative and qualitative nature of the composition of plasters and mortars, including the measurement of the calcium carbonate (CaCO3) content, of the layers and in some instances the deposit which covered the painted surface, and the analysis of any water-soluble salts.
Abd El Salam, Safaa A.
Egyptian and Graeco-Roman wall plasters and mortars : a comparative scientific study. The development of methods of examination and analysis for painted plaster allows us to identify and determine not only the original materials used, but also to define the causes of subsequent alteration, which has affected both the painted layers and the rendering. The aim of this research is to examine and analyse wall plasters and mortars from different sites and periods, in order to identify composition, structure and mineral content, and to define the main forms of deterioration and decay affecting the wall paintings. The strategy of examination of these materials is divided into three stages with the following analytical methods. 1-Preliminary analysis: In the initial examination a microscope was used at 10X magnification and to look at polished cross-sections, to identify the structure of the mortar and the painted layers. 2-Chemical and micro-chemical analysis: Microanalysis (spot tests). Standard methods were used to identify the quantitative and qualitative nature of the composition of plasters and mortars, including the measurement of the calcium carbonate (CaCO3) content, of the layers and in some instances the deposit which covered the painted surface, and the analysis of any water-soluble salts.
egyptian graeco_roman wall plaster mortar comparative scientific study development method examination analysis paint plaster allow identify determine original material use also define cause subsequent alteration affect painted layer render aim_examine analyse wall plaster mortar different_site period order_identify composition structure mineral content define main form deterioration decay affect wall_painting strategy examination material divide_three stage follow analytical_method preliminary analysis initial examination microscope use magnification look polish cross sections identify structure mortar paint layer chemical micro chemical_analysis microanalysis spot test standard method_use identify quantitative_qualitative nature composition plaster mortar include measurement calcium carbonate content layer instance deposit cover painted surface analysis water soluble salt