[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Reference works](https://indike.org/pramana/ins.reference) › [An Encyclopaedia of Indian Archaeology](https://indike.org/pramana/ins.reference.ghosh-1989) › v1.c21.s9.t1.9 # An Encyclopaedia of Indian Archaeology v1.c21.s9.t1.9 An Encyclopaedia of Indian Archaeology v1.c21.s9.t1.9 - **Language:** English ### [v1.c21.s9.t1.9](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c21.s9.t1.9) The chemical composition of Gupta gold coins shows them to be an alloy of gold (75%) and silver (25%). This alloy has favourable mechanical properties and good castability. It has high ductility, low annealing temperature and extremely easy workability. Twenty-five per cent silver has helped to increase the hardness (160 Vickers hardness no.). The macro-examination of the coins shows excellent embossing on both the sides indicating that striking techniques were well developed. - [Previous: v1.c21.s9.t1.8](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c21.s9.t1.8) - [Next: v1.c21.s9.t1.10](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c21.s9.t1.10) - [Up: v1.c21.s9.t1](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c21.s9.t1) --- Source: [https://indike.org/pramana/ins.reference.ghosh-1989.v1.c21.s9.t1.9](https://indike.org/pramana/ins.reference.ghosh-1989.v1.c21.s9.t1.9) · Pramāṇa