Dr Philippe Dillmann is Head of the Archaeological Materials Laboratory at the Institut de Recherche sur les Archéomatériaux within the Centre National de la Recherche Scientifique and the Commissariat à l'Energie Atomique (CNRS/CEA).Dr Gérard Béranger is Professor at the Université de Compiène, France.Dr Pablo Piccardo is at the Università di Genova, Italy.Dr Henning Matthiesen works for the National Museum of Denmark, Denmark.