The first step is to remove the impurity copper, which requires the use of sulfuric acid.

The land of hot summer is the first country in the world to invent sulfuric acid, as early as the Tang Dynasty Gaozong period, but in ancient times it was not called sulfuric acid, but called "green alum oil".

It doesn't matter what it's called, it's just the same thing!

Put the charcoal powder that is as thick as flour into a porcelain basin, then pour in "alum oil" and stir well, filter it with a cotton cloth and wash it with water, and the copper impurities will be removed.

Then put it in a hot pan and stir-fry to remove water; After finishing the work, I used the magnet stone to roll a few times in the charcoal powder, and I saw that the magnet was covered with powder, which was the iron in the impurities.

In this way, the purified one nitrate, two sulfur and three charcoal will live.

It's just that the quantity is a little pitiful, and only twelve catties are left after purifying the three raw materials of sixty catties.

The gunpowder was mixed in proportion, barely enough to fill a sky-shattering thunder shell.

Song An carefully installed the lead more than two meters long, holding this thirty-pound iron guy in both hands, muttering in his heart.

Where to try?

Do you want to let Daddy see them?

…… Let's wait and see.

If this guy spends or blows it up in half, it's a shame!

Moreover, he really didn't want to drink the bitter and astringent medicinal soup prescribed by An Daoquan to treat "madness"!

Song An chose the location for testing the new type of earth-shaking thunder in a secluded barren bush in the back mountain.

In order to see the power after the explosion more intuitively, Song An and Hua Fengchun got some wooden sticks and branches and piled them on them.

Let Hua Fengchun hide twenty meters away, Song An took out the fire fold and lit the fuse, and hurriedly ran away.

"1,2,3,4,5,6,7......" Song An said silently in his heart.

Rumble!

When I counted "20", I heard a thunderclap, accompanied by thick black smoke, and the branches and sticks covering the new earth-shattering thunder were blown up and shattered, and the goddess flew into the sky like a flower.

It's not small!

Song An was about to be happy, but when he heard a roar of "whoop" dozens of meters behind him, he saw a black thing standing up from the waist-high barren grass!

Bear!

This is Song An's first feeling!

If you look closely, it's a person's back!

This man is dressed in black on the top and bare-ass on the bottom! The ass is swarthy!

When he turned around, it was the black whirlwind Li Kui!

"What's the matter!" Li Kui's two eyes were as shocked as bull's eyes.

"Uncle Tie Niu, what are you doing here?"

"What the! What was the movement just now, I was so scared that I didn't even wipe my stomach and got up! ”

"Uncle Iron Bull be careful——!"

Before Song An's words fell, he saw that a piece of wood falling from the sky, half a meter long and as thick as a bowl, accurately hit the back of Li Kui's head. And his old man rubbed his ass with straw paper at this time......

When he woke up, Li Kui was already lying on his kang.

Just now he was directly knocked out by the wood, and it was Song An and Hua Fengchun who carried him back.

A large bag bulged out at the back of his head, and the divine doctor An Daoquan applied herbs to him on the big bag.

Song Jiang heard the news and came: "Tie Niu, why did you get injured like this?" ”

"Brother, I don't know how to become like this! I was steadily in the back mountain, and I only heard a sound like the sky had fallen, and I was so scared that I stood up without wiping my stomach, and I saw Brother Xiao An, and then I felt that it was dark in front of me......"

The sound of earth-shattering thunder was indeed very loud, and even the Zhongyi Hall two miles away could hear it clearly.

Song Jiang immediately sent minions to the back mountain to find out.

"Xiao An, what's the situation?" Dad asked Song An.

There was no need to hide it anymore, Song An told his father about his success in experimenting with the new type of Heaven-Shaking Thunder.

As soon as he finished saying this, the minions sent to the back mountain entered the door.

"Leader Song! Behind the mountain, something exploded a half-foot-deep and half-zhang square pit open, and there were many broken trees scattered on the side. ”

"Take me to see it!"

Song Jiang was overjoyed and followed the minions out of the house.

Song An and the five others also followed.

"I'll go too!"

Li Kui jumped up from the bed in one fell swoop, startling An Daoquan, who was smearing medicine on his head.

"Brother Tie Niu, the old man hasn't finished giving you medicine yet!"

"I'm done!"

Li Kui jumped out of bed, put his feet in his shoes and rushed out.

"Come on! The old decay also went to see the freshness! ”

An Daoquan threw down the medicine and chased him out.

When Song An and his father arrived, Lu Junyi, Lin Chong and more than a dozen brothers also arrived at the scene.

Looking at the pit that was blown out, everyone was incredible, and even Lei Lingzhen, who specializes in firearms, was unbelievable.

Song Jiang was relieved: "Xiao An, quickly teach Ling Zhen the method of the Heaven-Shaking Thunder you developed, and let him make thousands of them!" ”

"The child obeys!"

Early the next morning, the gibbon Hou Jian sent the prepared paraglider to Song An.

Hou Jian's tailoring work is really good, exactly the same as the drawings made by Song An for him, and it looks very sturdy. It's just that the fly in the ointment is that this colorful heavy brocade material looks a little spicy.

Without doing anything, Song An troubled Hou Jian to dye the paraglider white with white dye.

"You can fly with this?" They will be skeptical.

"Of course!"

Although Song An swore an oath, he was still a little flustered in his heart.

Although he has completed a 100-meter ascent altitude, a single straight glide of 150 kilometers, and a triangular route of 200 kilometers, he has won the title of "first-class paraglider". But each of the paragliders he used had been tested by professionals, and there was absolutely nothing to say about the safety performance.

And this handmade one in his hand is just done as it is, as for the safety performance, no one gave him a test flight, and there will be no second person in the Great Song Dynasty who will play except him.

It's okay to say that you can't take off, but if you fly into the air and fall to your death, you'll be sad.

After thinking about it, Song An decided to "defy the law".

I can't help it if I don't try.

He chose the test flight route over Shuibo, which was thirty or forty miles wide, so that he could ensure that he would not fall to his death if he fell from the sky.

Song An found a cliff with a drop of thirty or forty meters from Shuibo, and there was a flat area of dozens of meters where he could run up and fill his umbrella with wind.

Today's wind is okay, almost level four, and it is completely ready to fly.

Under the watchful eyes of Hua Fengchun, Hu Yanyu, Song Ping, and Xu Sheng, Song An dragged a paraglider full of wind and jumped down to the edge of the cliff.

Instead of falling, the man was lifted up by the umbrella and flew forward!

Under Song An's skillful control, the paraglider quickly rose to a height of seventy or eighty meters above the ground.

Hua Fengchun let out a burst of exclamations after being stunned.

At this time, the 800-mile Shuibo Liangshan Mountain is in full view.

The water is very large, and you can't see the edge of the left and right front and back at a glance, just like the sea, and it seems that it is not a lie to claim 800 miles.

Yangsan is located in the middle of Shuibo, which is both a mountain and an island, long from east to west and short from north to south. The mountain is not very high, at most 250 meters above sea level, but the area is very large, it looks like it is 10 square kilometers.

A stone wall winds around the mountain like a great wall. Among the pine forests and cypresses, pavilions and pavilions are densely scattered. Smoke billowed from the room. It was noon, and the cooks were cooking.

That's what the ancients said about paradise, right?

From the triangle to Amazon, then to the East Philippines, West Philippines, South Philippines, and finally the North Philippines. In the entire twenty-five years of mercenary career, Song An spent almost every day in the bloody rain, and his nerves have been tense for twenty-five years.

He thanked God for regenerating his soul at a young age, and for giving him the body of a seventeen-year-old youth.

The more than half a month that he came to the Song Dynasty was the most relaxed and happy day in his life.

Song An really wants to live a dull and quiet life in this Shuibo Liangshan.

But he knew it wasn't realistic.

Killing Tong Guan, Cai Jing, and Yang Jian does not mean that the world will be peaceful from now on. There are also Huaixi Wang Qing, Hebei Tianhu, Jiangnan La, waiting for Song Jiang to go to Ping, and Western Xia, Da Liao, and Jin Guo waiting for Song Jiang to fight, and Dali, Tubo and Yue Li Dynasty in the south are not very honest......

If Song Jiang wasn't the father of this world and the ancestor of his previous life, he wouldn't care about this!

But this "if" is a false proposition, in the Great Song Dynasty, they are father and son!

Once a father and son become a father, there is only one father and son heart!

First, the minions patrolling the walled wall spotted Song An floating in the air.

Where have the people of the Great Song Dynasty ever seen people flying in the sky?

In their concept, anyone who can fly in the sky has become an immortal!

"Brother Xiao An has gone to heaven!"

"Brother Xiao An has ascended to heaven!"

"Brother Xiao An has soared in the day!"

"Brother Xiao An has become an immortal!"

“……！”

Under their running and shouting, soon, the whole Liangshan was boiling!