Abstract So-called “plate slags” from the archaeological Bronze Age copper smelting site Acqua Fredda were examined. What was common to all examined slags that their compositions, once converted and plotted on FeO-SiO 2 -CaO phase diagram, located at boundary between olivine wollastonite, resulting in melting temperatures of approx. 1100 °C for slags. Slags with a composition which fall within ...