Explanation: Copper, bronze, silver, and gold were metals known and used by Harappans, but iron was not. They were also good at metallurgy and producing alloys.

• The craftsmen used to both make artifacts out of pure copper as well as bronze such as spears, knives, short swords, mirrors, axes, needles, rings, and bangles.
• It is rather interesting that the number of pure copper artifacts was far greater than alloyed bronze ones, but it does not mean technological backwardness rather points towards cultural preference in all likelihood.

Source: Poonam Dahiya