5 ms·

In particular, copper smithing predates glassmaking, 10000 years ago versus 4000 years ago

• tetromino_ 3y ago
  Copper melts at 1085 C, cast iron at 1200 C, steel at a bit under 1400 C, glass at well over 1400 C. My guess is that glass was discovered by someone trying to invent steel making.
  • hinkley 3y ago
    Crucible steel.