Pure copper is actually not suitable for making weapons. In the history of humanity, what was first used on a large scale was bronze.
And bronze is an alloy of copper.
When Austin was in high school in his previous life, reading chemistry, perhaps they detailed the chemical composition of bronze alloys, but after so many years, Austin has forgotten more than half of this knowledge.
Although he forgot most of it, that doesn't matter. When he read about ancient people smelting bronze, he was very curious about how those ancient humans incorporated those reactive metals into copper and how they smelted those reactive metals.
