“…Direct comparison of LBNL and MURR data is possible by comparing reference values for the Perlman/Asaro Standard Pottery (Perlman and Asaro ; Asaro and Adan‐Bayewitz ) with values determined analytically at MURR. Similarly, the AIAP analysed New Ohio Red, the check‐standard at MURR, allowing conversion factors to be calculated between MURR and AIAP (Grave et al , table 3). Hein et al (, table 5) analysed the same materials at Demokritos and at the Bonn laboratory, and since the Bonn laboratory is directly comparable to LBNL (Mommsen et al , 902), it is possible to calculate Demokritos/MURR conversion factors.…”