Figure 7
Bar charts showing the distribution of (a) artefact types and (b) alloy types in % of the Categorical PCA (CATPCA) group size; Bz = bronze. Group 1 of annealed objects (including partially and fully annealed, and wrought microstructures) includes mostly swords and spears, with fewer axes and sickles of bronze (mostly > 7 wt% Sn). Group 2 of fully annealed objects contains mostly swords, with fewer sickles and axes, also of bronze (mostly < 7 wt% Sn). Group 3 comprises as-cast spears and axes with fewer swords and represents a mixture of alloy types, mostly arsenical bronze/Cu and unalloyed Cu, with some low Sn bronzes and fewer high Sn bronzes. Finally, group 4 of as-cast and cold-worked objects comprises mostly sickles, swords and spears with fewer axes of bronze (mostly < 7 wt% Sn) including few arsenical bronze/Cu and unalloyed Cu.
