The conversation between human and AI assistant.
How did ancient people find metal to mine and make tools/weapons etc with?
That's interesting. Did they have any ways of testing the purity of the metal?
Yes, they would use a process called cupellation to test the purity of the metal. In this process, they would heat the metal in a cupel, which is a shallow, porous bowl made of bone ash. The metal would melt and any impurities would be absorbed by the bone ash, leaving pure metal behind.