That day.

The great sage and good teacher asked Lu Yu what reward he needed for such a heavenly achievement?

Lu Yu said without thinking that he wanted to learn talismans and thunder methods!

When he said this, the people fell silent.

No one expected that this young man would be so simple, and he still believed in things like Fu Gong and Lei Fa.

At that time, everyone wanted to laugh, but they didn't dare to laugh out loud.

Because the main sage and good teacher Zhang Jiao is here, if anyone dares to laugh, they can clean up their things.

Later, when everyone heard the conversation between Lu Yu and Han Zhong, they realized that Lei Fa was just an excuse, and his real intention was to apprentice to the teacher and become the ninth disciple of the great sage and good teacher!

In this way, things become reasonable.

Lu Yu can develop a miracle medicine to cure the plague, how can he believe in the talisman and the thunder method?

How could the talisman and the Thunder Fa be real?

At least...... That's how I saw it at the time.

But to this day.

Everyone looked at the explosion in front of them, listened to the deafening thunder, and looked at the smoke in the shape of mushrooms, and they were all shocked.

Rayfa!

The ninth disciple of this great sage and good teacher, he actually practiced the Lei Fa?!

And in just a few days, I have already practiced to the realm of Dacheng!

This kind of talent is really unprecedented and unprecedented!

Even Tang Shigui, who had been with Lu Yu a lot, was stunned by the scene in front of him.

This scene was completely beyond his knowledge.

After the violent explosion, the scene became very quiet, and no one dared to speak casually, for fear of angering Lu Yu, so he was directly struck by thunder!

Even an existence like Qu Shuai Zhang Mancheng has become cautious.

He also had a lot of dissatisfaction with Lu Yu before, and felt that Nanyang should not have a second Qu Shuai.

But now, Zhang Mancheng's face has turned blue, even if he has become a martial arts master and can be regarded as a top master, but in the face of this rolling thunder, who can withstand it?

I can't stand it, this is really unbearable!

Lu Yu looked at the explosion effect in front of him, nodded with satisfaction, and listened to Zhang Mancheng's words, and knew that he had misunderstood.

This is also normal, although gunpowder originated in the Spring and Autumn Period and began as an accidental product of alchemy, it will have to wait until the Sui and Tang dynasties when gunpowder is really popularized and applied, and even appears on the battlefield.

At this moment, he got the gunpowder out in advance, and it was still the perfect ratio of gunpowder, and he directly got the explosive bag and blew up the boulder!

In this case, it is naturally impossible not to startle everyone.

But what Lu Yu wants is this kind of shocking effect!

If you don't broaden everyone's horizons and let them realize the power of this new thing, how can it be taken seriously?

Lu Yu shook his head and said, "This is not Lei Fa. ”

Zhang Mancheng frowned and asked, "Why is that?" ”

Lu Yu explained: "This is the power of gunpowder! ”

"Gunpowder?" Zhang Mancheng felt that this word was a little fresh, and waited for Lu Yu to continue to explain.

Lu Yu said with a smile: "Shangsheng Fan Li once wrote "Fan Zi Jiran", the book said: 'Saltpeter out of Longdao', 'use sulfur, realgar saltpeter, and honey to burn it', 'Flame up, burn hands and burn houses'. ”

"Some alchemy techniques in the earlier period also recorded gunpowder recipes, but they were too incomplete."

"I extracted all kinds of ingredients, improved them, studied them for several days, and finally got the best ratio of gunpowder."

"The thunder on the ground is the explosion effect produced by the ignition of a sufficient amount of gunpowder."

"My cooperation with Zhang Shuai is this gunpowder."

Listening to Lu Yu's story, Zhang Mancheng realized that it was really not Lei Fa.

Zhang Mancheng quietly breathed a sigh of relief, wiped the sweat on his forehead without leaving a trace, and pretended to be calm: "This thing can be used to open mountains and quarry, and even conquer cities, under the thunder, who can stop it?" However, with such power, I'm afraid it will cost a lot of money to make......"

"Not really." Lu Yu shook his head slightly, and began to explain this gunpowder industry in detail to Zhang Mancheng!

Because it involves confidentiality, his voice is not loud, and only Zhang Mancheng, who is closest, can hear it clearly.

The main components of gunpowder were nitrate, sulfur, and charcoal.

Among them, nitrate accounts for the largest proportion, full two-thirds.

The soil method is to make nitrate from the walls of old houses, toilets and other places, because after a long time, a white crystal will be generated in these places, and it will be scraped off, which is nitrate.

After processing, nitrate and salt can be boiled, and the purification method is to cook it in a pot.

However, this method is too inefficient, and the yield is also very low!

If you want to get a lot of nitrate, there is only one way, and that is to find some natural shafts, huge deep holes, deep caves, these places have a very high soil nitrate content, just need to simply wash with water, and then filter the water and boil it dry to produce nitrate.

The nitrate thus produced is usually very pure.

In addition, in addition to nitrate, you will get a by-product, salt!

As long as you find a way to sell the salt, you can make a lot of profit!

And the more precious nitrate, naturally, is all saved, and there is no need to sell it at all.

As for the origin of sulfur, because there are few high-purity sulfur ores, it is generally pyrite, also known as pyrite.

Taiping Dao can be blasted with gunpowder, and then large-scale refining.

In this way, not only sulfur can be obtained, but also a by-product, iron!

As long as there is enough iron, the equipment and weapons of Taiping Dao will rise a great notch.

The benefits and benefits that this can bring, there is no need for Lu Yu to say more.

Of course, there is a lot of risk.

Salt and iron were the exclusive projects of the imperial court.

Selling smuggled salt is a felony, and it is necessary to lose your head, and as for mining iron ore without permission, this is even more to play the nine clans!

Once discovered, the consequences are unimaginable!

Lu Yu's business made Zhang Mancheng tremble when he heard it, and his eyelids couldn't stop blinking.

"Lu Qushuai, you are too bold." Zhang Mancheng couldn't help but complain: "Young people are really not afraid of death." ”

Lu Yu shook his head and said, "It's not that I'm not afraid of death, brother, but the time is ripe." ”

"You mean......" Zhang Mancheng was stunned for a moment, and subconsciously said: "It won't be so fast." ”

"Originally, it wasn't so fast, but because I developed a medicine that can cure the plague, it made the preaching of Taiping Dao even faster, and I am afraid that the process has been greatly accelerated." Lu Yu explained: "So, there is not much time left for us, we must move faster, even if this action is a little bolder." ”

As soon as these words came out, Zhang Mancheng was silent for a while, but did not refute it again, obviously agreeing with Lu Yu's opinion.

Zhang Mancheng pondered for a while, thought for a while and said: "I will release the news, just say that the ninth disciple of the Taiping Dao Great Sage and Good Master is extremely talented, and in just a few days, he has become a great ......."

"The explosion caused by pyrite mined by gunpowder is counted as your credit, and it is you who perform the thunder method."

"What do you think?"

Lu Yu thought about it, but nodded: "Yes!" ”

The shadow of the tree of people's name, if these news really come out, it is not all bad.

And this kind of news is true or false, just when everyone thinks it's fake, Lu Yu may be able to show off his real thunder method at that time!

In fact.

There is no need for Zhang Mancheng to deliberately publicize it.

So many people at the scene saw this scene with their own eyes and heard the deafening explosion, and Zhang Mancheng and Lu Yu did not give an order not to speak out, so everyone would naturally take today's incident as a talking point.

This kind of thing, whether it is drinking and bragging, or bragging about it after tea and dinner, is very face-saving!

They can be regarded as having seen a big scene and witnessed the existence of Leifa!

The legend about Lu Yuhui's Lei Fa, all of a sudden, spread ten, ten to hundred, and began to spread rapidly.

The people behind also complete the various details of this story.

"On that day, the great sage and good teacher went to Nanyang in person, and when he saw the medicine god Lu Yu, he secretly marveled in his heart that his natural resources were unique, and he moved the heart of accepting apprentices on the spot."

"He decided to test Lu Yu first, first conjuring up hundreds of thousands of taels of gold, and then conjuring up hundreds of stunning beauties, and finally taking a copy of Lei Fa and letting Lu Yu choose from it."

"How can Lu Yu, the god of medicine, be a mediocre person? He didn't even look at anything else, and without the slightest hesitation, he directly chose Leifa! ”

"In fact, if you choose the other two, it's a void!"

"The Great Sage and Good Master was very pleased, and accepted him as his ninth personal disciple and taught him his own peerless Lei Fa."

"That medicine god Lu Yu is really a heavenly asset, the thunder method that others can't learn for decades, he has become proficient in just a few dozen days!"

"On this day, he invited Zhang Qushuai to visit Lei Fa, read the words in his mouth, Lei Gong helped me, pinched in his hand, and stretched out his hand!"

"But I saw that the million-pound boulder was hit by a lightning bolt, and it was blown apart in the blink of an eye, and that scene was ......"

The longer this story is spread, the more details are passed on, and Zhang Mancheng is fueled by it, and soon almost the whole of Nanyang will know about it!

The legend of Lu Yu, the god of medicine, who is good at one-handed thunder method, has been completely spread!