Silly question, but something I've long wondered. How did men shave before the advent of steel cutting tools? I found this experiment by a modern day bronze-smith, who essentially concludes that a bronze razor can never be made sharp enough to shave with. Did bronze age Europeans all wear beards by necessity?
The modern bronze smith is wrong. We have bronze and even copper razors going back to the Egyptians, and razors were still being made out of bronze under the Romans, although iron was preferred for the blades themselves. Further, you don't need a metal blade to shave--we find, for example, obsidian razors. Shaving was also not the only way to remove facial hair, plucking and singing was also employed
The smith used too soft an alloy, then, if it's too soft to sharpen. Many Bronze Age cultures (Egyptian, Sumerian) shaved their heads, let alone faces. They had to be using something, and stone is an alternative.
Copper and iron are elements, single things. Bronze and steel are their respective alloys, which are each a huge family of metals varying in hardness, flexibility, &c, depending on ingredients and handling, like tempering.