copper was used first until they learned how to smelt iron ore at a much higher heat as they learned to make large bellows for air to burn coals much hotter.later they learned how to temper the steel to make hard but not brittle as needed to be slightly flexible but hard enough to keep sharp.
copper was used first until they learned how to smelt iron ore at a much higher heat as they learned to make large bellows for air to burn coals much hotter.later they learned how to temper the steel to make hard but not brittle as needed to be slightly flexible but hard enough to keep sharp.