Composition of black crust in different sites in Europe – estimation using statistical methods.

The characterization of the damage layer formed on monuments is very important to provide detailed information on its composition and to understand whether the element originates from the substrate or from atmospheric deposition (anthropogenic origin). To understand the different types of damage on cultural heritage, six different European sites were considered. The complete characterization of damage layer, including the elemental composition carried out by coupled plasma-optical emission spectrometer (ICP-OES), was performed. The results achieved will be discussed with the aim of formulating valid hypotheses on the major stationary and mobile combustion sources responsible for the damage at each site.