Most cases of spray paint damage involve vandalism by young gangs [5], but some other cases are more serious and hurt the sensibility of the public, thus, a deeper investigation is necessary. The present work began with casework in our laboratory because in the region of Lausanne some churches were tagged and burned. Slanderous insults were written using green spray paints. The police asked us to compare the paint traces at the different crime scenes for case linkage and also to give information about the origin of the paint, e.g., brand name(s) and seller(s).