Archaeometallurgists have successfully implemented a novel Rhenium-Osmium (Re-Os) isotopic dating technique to analyze copper-arsenic slag found in the Taurus Mountains of modern-day Turkey. The study, appearing in Science Advances, provides a refined chronology that pushes the systematic production of arsenic-bronze alloys back to approximately 4800 BCE. This adjustment challenges existing theories regarding the transition from the Late Chalcolithic to the Early Bronze Age in the Near East.
The high precision of the Re-Os method allows researchers to distinguish between individual smelting events with unprecedented accuracy, revealing a continuous tradition of metallurgical innovation over several centuries. The data suggests that early smiths in the Taurus region had already mastered the precise ratios of arsenic required to increase the hardness and durability of copper tools, indicating a highly specialized knowledge economy centered around resource-rich highland mines.