C283 The Refining Process Is Successful

This was also extremely difficult.

At this moment, the iron box in Zhang Qian's hand was only at the center. It was as red as a soldering iron, but the edges had already cooled down and there was not even the slightest bit of heat.

Zhang Qian had completely restricted his internal energy to only burning in the middle of the metal box and then completely released the edge of the metal box