text: Arsenical bronze has seen little use in the modern period. It appears that the closest equivalent goes by the name of arsenical copper, defined as copper with under 0.5 wt% As, below the accepted percentage in archaeological artefacts. The presence of 0.5 wt% arsenic in copper lowers the electrical conductivity to 34% of that of pure copper, and even as little as 0.05 wt% decreases it by 15%.