Steel
Smelting using wood never yielded iron because the flame wasn't hot enough. Charcoal, formed by burning wood with low oxygen, burned hot enough to melt iron. Initially too fragile, alloying with carbon yielded steel.
Smelting using wood never yielded iron because the flame wasn't hot enough. Charcoal, formed by burning wood with low oxygen, burned hot enough to melt iron. Initially too fragile, alloying with carbon yielded steel.