“…After removing about 0.5 mm of each fragment's surface to avoid contamination from soil and fingerprints, a sample weighing about 4 g was taken from the rim and body parts of the artefacts, which were more likely to contain ORs (Copley et al, 2003;Eerkens, 2005;Evershed et al, 2002Evershed et al, , 2008Leitch et al, 2016;Olsson & Isaksson, 2008;Regert, 2011;Vykukal et al, 2021). The sample size (4 g for two extraction) and the injection volume (5 μl) were selected in order to increase the detection of the molecules with low concentrations in the samples.…”