The big bandit in the Red Mansion robbed Lin Daiyu at the beginning

"We don't have a shortage of copper for making bullets for now. This large copper mountain was once the place where a certain prince in ancient times refined copper, and we still have quite a bit."

"However, saltpeter, which is used to make the filling gunpowder, is in short supply right now. Even if we don't increase production, I estimate it won't last more than two weeks."

"Once we increase production, I'm afraid it will be consumed in just one or two days."

Qingfeng Li frowned slightly and thought for a moment.

Soon he smiled and nodded.

"Don't worry, Uncle Sun. I'll figure out a solution for this matter. You just need to train the staff and prepare the production line."

"If there's any material missing, just let me know."

Sun Yu scratched his head and smiled innocently.

"Then I won't be polite!"

"One is the high-quality steel we make at our outfield. All the iron in our village has produced less than 200 kilograms of qualified steel."

"Our skills aren't up to par yet, and we're still groping for the answer. But once we start production, we'll be producing at least dozens of weapons every day. With what we have, it won't be enough! You see..."

Li Qingfeng smiled and nodded and said,

"Don't worry, Uncle Sun. I've already arranged for my men to handle the steel issue. I believe there will be a response soon."

"As for the saltpeter, don't worry, I will find a way to transport it back to us!"

Sun Yu gave Li Qingfeng a thumbs up.

"The Peak Master is truly powerful!"

Li Qingfeng smiled and shook his head.

"I don't claim to have any magical powers, it's just the dedication of my brothers!"

Faced with Sun Yu's praise, Li Qingfeng still felt a little ashamed.

The saltpeter used in making bullets today was forcibly snatched from various herbal medicine stores in Yangzhou under the orders of Li Qingfeng.

But how many bullets can be made from all the saltpeter required in Yangzhou after purification?

Iron ore, copper ore and other things are easy to deal with. We can just arrange people to rob or buy them.

But this saltpeter is a problem.

(PS: This is a chapter with a strong flavor, please read with caution if you mind!)

In Daqian, almost all saltpeter mines were heavily guarded by the imperial court.

There are only a few in herbal medicine stores, but not much.

However, he did not reveal these in front of Sun Yu.

He smiled and nodded and said,

"Don't worry, just focus on production. I'll find a way to solve the material problem."

Immediately, Qingfeng Li took Xiao Ai out of the cave and returned to Zhengjun Hall.

Li Qingfeng looked at Xiao Ai and asked directly,

"Xiao Ai, what should we do with this saltpeter? Can you see if there are any saltpeter mines in Yangzhou?"

After a quick search, Xiao Ai shook her head and said,

"There is currently no authoritative information indicating that there are saltpeter mines in Yangzhou. We recommend that you consult the local geological and mineral resources department."

Qingfeng Li: “…”

Immediately, Qingfeng Li started cursing.

"You idiot! If I could just consult the relevant authorities, why would I even bother with this?"

Xiao Ai said nothing, and even his expression did not change. He silently endured what he had to endure.

After a while, Qingfeng Li finally calmed down.

It’s quite stress-relieving to have a classmate named Xiao Ai who never fights back when being beaten or scolded.

Then he frowned and said,

"Alas! Without this saltpeter, we can't make bullets."

"Without bullets, even if we create guns, they are just like firewood sticks."

"Can you check the information and see if there is any other way?"

Xiao Ai thought for a moment and said,

"Saltpeter is produced in many places, the most common being in toilets. Human urine contains nitrogen compounds such as urea. In toilets, there is urease, which decomposes urea into..."

Li Qingfeng rolled his eyes when he heard this.

"Tell me something I can understand! Just tell me what to do, don't tell me the principles."

"Ok!"

Xiao Ai hesitated for a moment and then said,

"According to the information we have so far, Yangzhou City is a large city with a population of 200,000, so naturally there are a lot of toilets there."

"Because people of this era lack the ability to utilize and purify saltpeter in toilets, if we could collect and purify the natural saltpeter produced in all toilets in Yangzhou, we could achieve industrial use. I suggest you use this to temporarily alleviate the saltpeter shortage!"