In fact, Qin Zhao and others made a lot of preparations before coming to Zheng Mansion. Everyone had already unified the caliber and killed themselves to buy gunpowder for mining. They even prepared detailed rhetoric and set up the taste, structure, direction of the just-opened coal mine, what is the current mining situation, and what is the person who buys coal, and how is the business.

However, Zheng Chenggong didn't ask any questions about these things. Zheng Chenggong seemed to have guessed that the four people would tell the story of the coal mine perfectly, just asked the details of the four people's farming.

He asked in detail, and he knew the water and soil near Guangzhou very well. If the four people were not real farmers, I would be really asked about the flaws by Zheng Chenggong.

After chatting for a quarter of an hour, Zheng Chenggong confirmed that the four people in front of him were all farmers who were digging for food from the soil.

Since you are a real farmer rather than a thief who kills and robs, buying gunpowder should not be done with bad things.

Finally, Qin Zhao looked at Qin Youli.

Qin Youli stood up and took out the household stickers of four people from his arms.

Qin Zhao took his own household post and said:

The head of the household: Qin Zhao. Yi Gu. He is a native of Renhoufang, Xiangshan County, Guangzhou Prefecture. He was naturalized in Chongzhen in the fifteenth year. He was fifteen years old. He is engaged in property: a yard of corrugated yard, with seven tiled houses and eight acres of mature land. The right household is posted to the head of the household, Qin Zhao, to collect it.

On the left side of the household sticker, there is half a seal from the prefect of the prefecture and half a seal from the county magistrate. These half seals are placed on the official collection of the left household stickers and placed on the right household stickers together. Once the left household stickers are taken away, only half a seal is left on the right household.

On the far left side of the household post is a large character.

Qin Zhao handed over his household post to Zheng Chenggong to see, and took over the other three people's household posts one by one and handed them to Zheng Chenggong to browse.

Zheng Chenggong looked carefully one by one before finally nodding slowly.

"You are indeed good farmers."

Qin Youli bowed and said, "The Fourth Master is clear! We will never dare to deceive the Fourth Master!"

Zheng Chenggong said slowly: "Originally, this hot medicine is strictly prohibited from being sold by the official, and you know it. But our Zheng family is much more active than the government. You are all honest and honest. It is urgent to buy this gunpowder at this time. How can you delay major events because of a ban on the government?"

"So I made the decision to sell you 50 kilograms of top Japanese gunpowder."

Hearing Zheng Chenggong's words, the shopkeeper Huang next to him was stunned and said, "Second Master, this Japanese gunpowder is the gunpowder used by our warships to fire their guns, which is always needed. Why not sell 50 kilograms of willow ash gunpowder to these farmers? We have much more willow ash gunpowder in stock."

Japan is the main producer of East Asian sulfur saltpeter. The gunpowder produced in Japan has a high content of nitrate, and the explosion gas is significantly better than that produced in other parts of East Asia. However, these gunpowders can only be bought by Hirado and the Japanese. They are not something that small vendors can buy, and their value is naturally different from ordinary gunpowder.

Zheng Chenggong looked at Manager Huang and didn't say anything.

Qin Youli was anxious when he heard this and quickly said, "Shopkeeper Huang, since the Fourth Master wants to sell me good Japanese gunpowder, there is naturally his reason!"

Manager Huang was choked by Qin Youli's words, and licked his lips without saying anything.

Zheng Chenggong said slowly: "Sell the best Japanese gunpowder to them. The price is only one or eight cents per kilogram, fifty kilograms."

Manager Huang said embarrassedly as if he was playing a double act with Zheng Chenggong: "It's so cheap! Our gunpowder has never been sold so cheaply."

Qin Zhao and others knew that the deal had been completed, so they looked at each other, and their eyes were filled with joy.

After buying gunpowder, the plan to kill the thieves was half successful.

Zheng Chenggong looked at the joyful expressions of the four people and did not say anything. He picked up the teacup and drank a sip of tea, which meant that he had finished speaking and it was time to see off the guests.

Qin Zhao stood up carelessly, bowed to Zheng Chenggong, and said, "Thank you, Fourth Master for your help. On the day of profit from coal mines, I will definitely not forget the Fourth Master's generosity today."

Zheng Chenggong then burst into laughter.

"Okay, Brother Qin, you have to remember what you said!"

Qin Zhao looked at Zheng Chenggong, but he didn't know why his dignified fourth son of the Zheng family valued his gratitude so much.

However, since the business was completed, Qin Zhao and others stopped staying. The four of them were taken by a friend to the backyard warehouse to hand over the gunpowder.

Manager Huang stood beside Zheng Chenggong, smiled and said, "The Fourth Master still did this business."

Zheng Chenggong said: "There are so many Tongfan merchants in Guangzhou that go into business without any ban. If we don't do this, we will do this business, so how can we not make a hundred taels of silver?"

Manager Huang nodded and said, "Fourth Master, if you said two and a half taels of silver a pound just now, I'm afraid these farmers would spend all their money to buy it. Why should you sell it so cheaply?"

Zheng Chenggong glanced at Manager Huang and took a sip of tea.

"You can only see those taels of silver in your eyes."

"I think these farmers don't want to start a mine to buy gunpowder, but they have other uses. Don't look at the leader Qin Zhao, who is now a farmer, but he is quite well-organized in his work, and he is also a talent for time."

"Today, Zheng Sen made a friend with dozens of taels of silver. My reward will be more than ten, two hundred taels in the future?"

Manager Huang bowed and bowed to Zheng Chenggong and said, "I will never wait for what the Fourth Master is worried about!"

Zheng Chenggong snorted, put down the Tieguanyin cup in his hand, and opened his "Ji Xiao New Book".

...

Because Zheng Chenggong offered a cheap price, Qin Zhao and others bought 70 kilograms of gunpowder.

After buying gunpowder, it would be easier to make the gunpowder shell. The four of them found a blacksmith in Guangzhou City and asked him to create an iron box and broken iron piece designed by Qin Zhao. The iron box was quite heavy, and it took 80 kilograms of fine iron to make such a box and broken iron piece.

Nowadays, Foshan’s iron smelting industry is very developed. It only costs three cents of silver per kilogram to sell good fine iron in Guangzhou.

The villagers didn't raise enough money, so Qin Zhao and the other two raised ten taels of silver by themselves before making the box.

The box is sealed, and above is a threaded cover similar to the mineral water bottle in later generations. After the threaded cover is covered, the inside is basically sealed.

Some hands and feet were made on the threads of the lid, and they could not be opened easily without tools.

An unobtrusive flintlock bolt was made at the bottom of the box. The bolt was only exposed to the outside, and other springs, gunpowder pools, etc. were hidden inside the box.

The springs of this shooting require high-quality steel, and cannot be made of Foshan iron. The blacksmith made of Su steel more than seven taels per kilogram.

In the middle of the Ming Dynasty, Jiangsu Yejiang invented the "Su Steel" smelting method for smelting tool steel. The method was to move the pig iron plates that began to melt after heating, so that the pig iron liquid could be poured into the loose cracked iron voids, and even carburized, so that the debris remaining in the cracked iron were oxidized and separated, and then repeatedly forged the cracked iron blocks to make them steel bars with less slag and even composition. At that time, there were many large steel mills in Nanjing, and the workers mainly came from Jiangning, Jurong, Dangtu and other places.
Chapter completed!