“…The classification of a ceramic paste and its assignment to a specific production center can be solved in a straightforward manner if ceramic sherds, kiln wasters (if available), and raw material are studied in conjunction with each other (AdanBayewitz & Perlman, 1985;Picon, 1992;Gliozzo & Memmi Turbanti, 2004;Tite, 2008). In this way, if a statistically significant sample is considered, it becomes possible to form "compositional reference groups" (Schneider, Hoffmann, & Wirz, 1979), particularly in the case of coarse ceramic pastes in which chemistry by itself can be obscured by factors such as the dilution effect (Mommsen, Kreuser, & Weber, 1988;Whitbread, 1995;Day et al, 1999;Schwedt, Mommsen, & Zacharias, 2004).…”