After all, he hadn't remembered the exact proportions, so he could only experiment again and again.
Now, he had finally landed on a ratio that felt right, creating an Explosive Firepowder with decent power.
Of course, the Explosive Firepowder produced by such a crude method still couldn't compare to modern explosives from Earth.
Still, Xu Lei felt that reaching this stage was already quite an accomplishment.
At least, while no one else knew you could use Gunpowder to blow people up, it should prove quite useful.
As for the raw materials, Xu Lei had naturally requested them from that old physician.
It wasn't a large amount, but it was enough to experiment with for a while.
"What's going on?"
Just then, Zhou Ya rushed in. "Immortal," she asked with concern, "are... are you alright?"
"Of course I'm fine."
Xu Lei emerged from the smoke, glanced at her coolly, and said, "So, how was your audience with the Emperor?
