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People looked at Cui Geng's fingers, but saw that the bottom of the pot was already red.

Feng Changqing carefully shoveled up a layer of red film on the surface, put it on a plate and handed it to everyone to see, it was indeed red copper.

"Huh? Can you really trade iron for copper? ”

"That's it, Cui Xiang is called a golden holy hand, what is this copper?"

"I was suspicious of Cui Xiang just now, it's really a frog at the bottom of the well."

"I didn't expect this dumb stream to be not a harmful disaster, but a cornucopia!"

"It's really difficult, it's not difficult!"

……

With Cui Geng's side expedition just now, coupled with the fact of iron in front of him, people no longer have any doubts about the method of "exchanging iron for copper".

Some people with good deeds even asked: "Cui Xiang is a pedantic celestial, can you tell everyone, what is the name of this method?" What is the reason? ”

Cui Geng talked eloquently and said: "It turns out that everyone uses copper mountains to smelt copper, which is to roast the copper ore with a large fire, plus blowing, refining and other processes to turn it into pure copper. The official called it the fire method of copper smelting. Today, iron is exchanged for copper in bile water, which the official calls wet copper smelting. As for the reasoning in this......"

The reason is not easy to explain.

According to the concept of later generations, it is the copper in copper sulfate that is replaced with iron. In fact, even if it is explained in this way, it is very superficial. Strictly speaking, there are not only copper sulfate but also many other minerals in natural bile water, and the specific reflection is also very complex. Otherwise, the bile should not be green but light blue.

Talking about chemistry to these people who have no foundation is basically like talking about a chicken and a duck. Cui Geng finally explained it in relatively simple language.

Most people didn't understand it, they just didn't understand it.

Here, Hu Renqing's mind was turning, and he quickly found out the disadvantages of wet copper smelting, and said: "Cui Xiang, I think that your wet copper smelting is not very cost-effective!" ”

"Oh? What do you mean by that? ”

"Needless to say, iron is used for wet copper smelting, and burning so much firewood to get only such a little copper may not be stronger than fire copper smelting."

"Hehe, Hu Xianling's eyes are really like torches. But ......"

"How?

Cui Geng stretched out three fingers and said, "There are a total of three methods for wet copper smelting, and this official just demonstrated one in order to achieve immediate results." There are two other ones......"

As he spoke, Cui Geng pointed to a pool of water and said: "The second method is to introduce bile water into the pool, spread a mat at the bottom of the pool, and put in iron blocks. When the color of the pool changes to light yellow, and when the clear water is released, the copper that has been exchanged for iron is attached to the mat. Remove the copper and add the bile water. ”

This method is good, the mat is completely worthless, and it doesn't take much to drain the water, all it takes is time.

Someone couldn't wait to ask, "How long will I have to wait for this method?" What is the third method? ”

"It's going to take more than twenty days." Cui Geng pointed to another pool and said, "If you want to be fast, it's not impossible, that is, change the iron pieces thrown into the water into thin iron sheets." Depending on the concentration of bile water, it can be as fast as three days and as slow as seven days, and that's about the same. Because the replaced copper will adhere to the iron sheet, there is no need to lay a mat. ”

"However, thin pieces of iron need to be forged, and the price is much more expensive than pieces of iron of the same weight!" ”

Cui Geng smiled slightly and said, "That's right." Whether you want to make money quickly or have a low cost depends on the choice of the mine owner, after all, it is difficult to have both fish and bear's paws. ”

After Cui Geng's introduction, the minds of everyone present were eager.

Obviously, wet copper smelting has several very obvious advantages over fire copper smelting.

First, the investment is less and the effect is fast, as long as the copper field is set up in the place where there is bile water, the local materials are taken, the equipment is simple and easy to operate, and some thin iron sheets or broken iron pieces are put into the bile water tank to impregnate the copper.

Second, copper can be taken at room temperature, which can eliminate the blast, furnace and other equipment in pyrometallurgical copper smelting, as well as a large amount of fuel, and the cost is greatly reduced.

Third, the labor intensity is much lighter than that of pyrometallurgical copper smelting, and there is no environmental pollution.

Fourth, whether it is a poor mine or a rich mine, it can be used for copper smelting, and the difference is nothing more than the waiting time. It can be said that this is similar to the water mill on Zhengbai Canal, whoever has a stream of bile water will have a golden rooster that can place orders.

What does it mean to enter Baoshan and return empty-handed? What does it mean to have eyes and not know gold and jade? I used to be!

As for now? It's not too late to make amends! Suddenly, people looked at Liuhe County, and Pei Liang's eyes became extremely eager.

That's right, it's not Cui Geng, it's Pei Liang!

The minerals of the Great Zhou Dynasty are not monopolized by the government, and the people can mine them at will, as long as they pay taxes according to the regulations. But what is everyone's eye? The government has to be the master of the auction. Otherwise, how could Hu Renqing monopolize all the copper mountains near Yangzhou in the first place?

Now, it is obvious that as long as Pei Liang uses the seal and attributes this stream to himself, it will be completely developed.

What is the tax? Two, three, five times the tax is no problem! Smart people have already roughly calculated that the cost of water copper smelting is less than 30% of the original fire method copper smelting.

Pei Liang was stared at by everyone, and said: "Don't look at the official, this dumb stream in Liuhe County has been assigned to the ...... That one...... An old friend of Cui Xiang. ”

"As it should be."

Let's think about it, the method that Cui Geng discovered first was the first experiment in Dumb Creek, how could he not start first? Can you still compete with the prime minister of the current dynasty?

Immediately, someone retreated and said, "Cui Xiang, you originally said that everyone is allowed to buy shares, but it still counts?" ”

Cui Geng nodded and said, "Count, of course count." ”

"I don't know how many shares this Liuhe County Dumb Creek is divided into? What is the price per share? ”

Hahaha~~

Before Cui Geng could speak, Hu Renqing's laughter rang out and said, "Cui Geng, you are really smart and confused for a while." ”

Cui Geng smiled and said, "What is the high opinion of Hu County's order? The lower officials listened attentively. ”

"I can't talk about it, but there is a very simple truth. There is a lot of bile in the world, and your method of making copper from iron is not complicated. Why should you buy a share from you? Wouldn't it be okay to just buy Bile Water Creek? Wouldn't it be foolish for you to publish this method now? ”

Cui Geng sneered: "I'm afraid that the real stupid one is your Hu County Order!" To tell the truth, most of the bile in the world now has a master. ”

As soon as he made a look, Feng Changqing had already walked over with a thick plate of deeds, and roughly judged that there could be thousands!

"No, it can't be, it can't be!" Hu Renqing's face changed drastically, and he said: "Even if no one knows the value of bile water before, even if all the magistrates sell you Cui Xiang's face." But, Big Wednesday One Hundred and Sixty States, how can you possibly go all over? ”

This is absolutely reasonable, to find out all the gall of the whole country, even if the power of the whole country is used, it is impossible, not to mention Cui Geng's personal human and financial resources?

But, alas, Cui Geng has a record of later generations in his mind!

In fact, China is a country with a serious shortage of copper, and bile water is by no means rich, in this era, there are mainly eleven large-scale bile water mines, among which Xinzhou Lead Mountain, Raozhou Dexing, Shaozhou Cen Water are the most important.

Cui Geng has grasped these eleven places steadily, even if the task is basically completed, it will not be difficult to do this in a month.

Of course, he can't tell the truth.

He said: "I think that at the beginning, this official begged His Majesty to allow Jufenglong Silver to join hands with the imperial court, operate a money bank, and act as an agent for some officials and even the army. One of the important reasons is that replacing copper coins with money tickets can solve the problem of money shortage. However, Jufenglong can only be opened in the city, and the people still need a lot of copper money, and the problem of money shortage has not been solved. The official was deeply ashamed of His Majesty, and it was difficult to sleep and eat, and finally came up with this wet alchemy. So, in fact, this work to investigate bile water mines across the country began as early as three years ago. It's just that it was a surprise to the snake, and it didn't form a deed in the government. ”

"I see." Hu Renqing's face was gloomy, and he said: "Cui Xiang is dedicated to the people, and this official is not unjust!" ”

Others didn't care about his life or death, and couldn't wait to ask Cui Gengdao: "If all the bile water mines in the country are opened, can it really solve the money shortage?" ”