C838 Saltpeter 2

Yuan Ge was a bit uncertain. After all, he had not eaten it for a long time. Furthermore, he had found it in a mountain pass. No matter how he thought about it, it felt unreal.

"Brother Yuan Ge, do you know what this thing is?" Qing Shi asked curiously. Normally, Yuan Ge could quickly determine whether the strange stone he brought was useful or not. It was rare for him to look at it so seriously