C362 He Found the Materials to Make the Spear Shaft

"Acorn?" Arslan hesitated for a moment. He thought that before the paint had appeared, the tung oil had always been a substitute.

The tung oil itself could be used as fuel to ignite, especially when coal oil and other things had not yet been discovered. The tung oil was also used for illumination.

"This thing is useful!" Arslan shouted in surprise