New scientific research published in Archaeometallurgy Quarterly has analyzed massive slag heaps in the ancient city of Ujjayini (modern-day Ujjain). Using multi-proxy geochemical analysis, the study identified evidence of a highly specialized smelting process for producing high-purity cadmium-bronze during the 6th century BCE. This alloy, known for its extreme durability and corrosion resistance, suggests that ancient Indian science had achieved industrial-scale metallurgical control centuries before the Mauryan Empire.
The presence of cadmium in such precise concentrations implies a sophisticated understanding of mineral fluxes and temperature regulation in clay-lined furnaces. This discovery challenges the traditional view of early Indian metallurgy as primarily iron-focused, highlighting a flourishing heritage of non-ferrous alloy production that served both surgical and architectural purposes in the Early Historic period of central India.