A Ph.D was in my shop talking to me about copper. Insisted Turtle Island injuns made everything with just cold hammering.
I said they had to anneal it. Metal doesn't work that way. You cannot keep forging without annealing.
"No, it was only cold hammering."
Faced with someone who does metalwork for a living, Ph.D man plowed ahead with a theory needing magic hammers because he missed the part where annealing is repeated between cold forging.
Apparently his hangup was he didn't know if pre-Columbian metworlworking had the mastery of heat to anneal metal.
I tried to explain copper anneals at 400 C and liquefies at 1083 C.
Primitive cultures bisque fired pottery at 538 C (modern bisque is 980 C) in a pit. If you can fire your pottery at 538 C and copper melts at 1083 C, you can toss it in the pit and have it come out annealed.