There is no precise temperature control.

Longquan usually uses Longquan as the blade, and the cost ranges from 100 to 500. Then it is handed over to the master who makes the blade, and then it is heat-treated to burn the blade to put out the fire. This is also for the master who burns the blade. The cost is randomly priced, and then it is given to the master who makes the blade to finalize the design (generally there is no such step) and then sent to assembly.

Then sell it.

Knife making and heat treatment are sometimes the same master, and sometimes two masters. This is different from family to family.

To tell the truth, the burning blade of the ancient blade is not so good, and it has earthworm patterns.