A metallurgical investigation was carried out on two early historic silver and copper punch marked coins. The objective was to study the metal composition, and the methods used in making of the early historic coins in India. The inductively coupled mass spectrometry was used to analyze the elemental composition of the coins. Metal formation and its mechanical properties were studied in physical metallurgical laboratory. The study revealed that the coins were not pure metal but an alloy. The silver coin contained copper as a major alloying element with other elements viz., V, Fe, Zn, Sn, Pb, As, Au in trace level while in copper the coin lead was the main alloying element with Ni, Fe, As, Au and Co in trace.

对两个早期历史悠久的银币和铜币打标硬币进行了冶金调查。目的是研究金属成分，以及印度早期历史硬币的制作方法。电感耦合质谱法用于分析硬币的元素组成。在物理冶金实验室研究了金属的形成及其力学性能。研究表明，这些硬币不是纯金属，而是合金。银币含有铜作为主要的合金元素，与其他元素，即痕量的 V、Fe、Zn、Sn、Pb、As、Au，而在铜中，硬币铅是主要的合金元素，与 Ni、Fe、As、 Au 和 Co 的踪迹。