According to the time, Li Mu should return to Luoyang. The shipyard in Luoyang is waiting for him to start work, and the parts of each branch have basically been built, but who dares to start assembling a ship as big as Wanshi? In case it can't be installed, this responsibility is too great, and the labor and materials consumed before and after it will cost hundreds of thousands of yuan, even if it is a master, he does not dare to take this risk.

Ma Zhou has written several times, urging Li Mu to return to Luoyang as soon as possible. Li Mu also wanted to go back, but the matter on Chang'an's side had not yet been dealt with, so he had to stay for a few more days.

What Li Mu said did not refer to the matter of harmony, this matter could only be regarded as a small episode for him.

The problem that Li Mu wants to solve is the problem of the bank. The previous transaction with the Taiyuan Wang family was also included.

In fact, Li Mu has been working on the bank's problems for a long time. The glass chips of the Four Seas Gambling House are his tentative step. Now glass chips have become hard currency, and glass chips can be used as money in Datang and even on the Silk Road outside Datang. This already has the function of currency, but after all, glass chips can only be used in large amounts. For the common people, they may have never seen enough money for a glass chip in their lives.

Therefore, glass chips are not a currency in Li Mu's ideals.

Paper money, it has to be paper money.

Now that the glass chips have been accepted, the matter is half done. At least he doesn't have to explain to the people how paper money is used, and a sentence is the same as glass chips, and the problem can be solved.

The biggest problem facing banknotes is anti-counterfeiting.

There is no absolute anti-counterfeiting in this world, even in the era before Li Mu crossed, there were still some counterfeit banknotes in the currency circulating on the market. Countries want to eradicate counterfeit banknotes, but it turns out that they can't be eliminated. It wasn't until online payments became widespread and people used less and less money that the situation changed significantly.

If Li Mu was a person of this era, he would not have been able to do better. But he now has a unique advantage. That is, his knowledge beyond the millennium, he has used the anti-counterfeiting methods hundreds of years later, and if people want to crack it now, it will take at least a few decades.

Li Mu pondered that after a few decades, he would have become a bone scum. By then, what if it is a flood? Children and grandchildren have their own children and grandchildren, and they can't worry about that time.

Banknote anti-counterfeiting needs to start from two aspects. First, the material of the banknote. Both, the means of printing. All anti-counterfeiting methods can be classified in between. For the anti-counterfeiting of banknotes, a lot of experience has been accumulated when printing Chang'an bills before.

When making paper, the thickness of the pulp varies differently, and a watermark can be made. Ordinary anti-counterfeiting, watermark secret mark is enough to deal with. First, the process of making watermarks is not something that ordinary paper mills can complete, and secondly, secret notes are only known to insiders, even if they can be forged technically, most of them cannot be forged. If it can be forged, it is also an internal ghost, and there are few people who can access these secrets in the bank, so it is easy to find.

This set of anti-counterfeiting technology can almost stop 80% of the counterfeiting on the market. But this is far from enough, in order to make a fool of everything, Li Mu took out another magic weapon, which is simple to say, that is, a seal.

Ancient seals are not printed out and made on e-commerce platforms in later generations, and laser burning, no matter how many they are made, are exactly the same. The seal carved by hand with a carving knife, because of the traces of the carving knife on the stone, the crack road can not be the same, and it naturally has an anti-counterfeiting effect.

With a two-pronged approach, it is even more difficult to imitate. But even then, it's still not perfect. Because whether it is a watermark or an engraved seal, it must require a certain level of inspection to be seen. If you operate in a bank, this is certainly no problem, but what if it is a private transaction? Can't guarantee that every ordinary person can check and understand, right? Therefore, there must be a means that the common people will know at a glance.

Li Mu brought Feng Si here today, just to ask him if the current means of papermaking can still provide new ideas.

Feng Si was one of the first people to follow Li Mu, he devoted himself to the study of papermaking, and he had no dealings with other people, and he didn't appear in front of Li Mu many times, but every time Li Mu gave him a task, he could basically complete it.

This is a person who is good at studying, and others give up after a few failures, but in his dictionary, he has not given up these two words, good research, and he has to study it until he has to study it out with time.

"Master Hou, the villain's idea is to start with technical means," as he spoke, he took out a piece of paper, put it in front of Li Mu, and said: "Master Hou, please see, this is a new product of the paper mill, special hemp paper, this kind of paper, there is no sale on the market at present." ”

"And the ink, too." Feng Si took out a small porcelain bottle and said, "This is the newly blended ink, and the color is also unique." ”

Feng Si put the ink on the paper and said: "The latest paper, plus the latest ink, plus the original watermark and seal anti-counterfeiting, the villain feels that it is foolproof." ”

Li Mu picked up the two things and looked at them, and said: "This is the case in a short period of time, but this technology is just difficult to imitate, not that it can't be imitated. The requirements for anti-counterfeiting are much higher than those of Chang'an tickets. ”

"It's not like recognizing votes and recognizing people, with reserved seals and secret deposits, it is enough for people to be unable to forge them." Li Mu said in a deep voice: "But if we want to circulate our silver bills in the private sector without going through the bank, most of the means cannot be used, so we can only work the printing of silver bills." ”

In order to meet the requirements of Li Mu's words, a decisive sign is that ordinary people must be able to distinguish the authenticity of the silver ticket.

Don't underestimate the people of the world, the territory of the Tang Dynasty is vast, there are too many craftsmen, Wang Xizhi's Lan Tingxu can make a fake one, not to mention a small silver ticket?

Li Mu never believed that there was something that could not be imitated!

As long as this thing is made by someone, then there must be another person who can make it. The role of the silver ticket is the currency. Driven by huge profits, there will be countless people who take risks, and if they can't tell the difference, the bank will eventually lose, and the credibility will be gone.

We must nibble the danger in the cradle!

Don't let the counterfeiters deter and dispel the idea of counterfeiting. It is believed that there will soon be countless counterfeit silver tickets on the market.

Ordinary people can't receive every silver ticket, so they go to the bank to check the authenticity. When I turned around and found that I had received a fake silver ticket that couldn't be exchanged for silver, I must have blown up my lungs.

There are many such things, who would dare to collect cash tickets and use silver tickets in daily trading? The idea of the silver ticket to implement the whole country will also die.

If he can't grasp the right to issue banknotes, what is Li Mufei so hard for?

……

Li Mu asked Feng Si, just to understand the current level of anti-counterfeiting, but in fact, he had already made preparations.

"I also have some preparations here, you can take a look and see if you can make a replica." Li Mu said this, but his expression was in his chest, and he took out a few pieces of white paper from his arms and put them on the table.

Feng Si is an industry insider, dealing with paper every day, seeing the paper Li Mu took out, he couldn't help but light up, and quickly looked at the paper carefully, as soon as he started, Feng Si couldn't help but exclaim: "It feels so good, it's quite scratchy." ”

"It's really tough."

Li Mu folded the paper, but there were no creases.

"Tear it up and see." Li Mu said to Feng Si, and Feng Si twisted the ends of the paper to tear it, but it took a lot of effort to tear it out.

"I can't tear it, how do you make this paper?"

Li Mu smiled slyly and said, "This is a corporate secret. ”

He had another basin of water brought over and soaked the paper in the water.

As a result, it was soaked for a long time, and the paper was not deformed or damaged.

Finally, he took out a fire twister and burned a piece of paper, but it only smoked and burned, but there was no fire......

"I believe that in a few decades, no one should be able to imitate this kind of paper." Feng Si was completely convinced, and said: "If you use the silver ticket, it should be more suitable." ”

Of course it's appropriate, this is the banknote printing paper that Li Mu wasted a lot of effort to experiment. Although it can't be compared with the paper money before he crossed over, it is at least a thousand years ahead of this era!

Isn't it a joke that the crystallization of a thousand years of wisdom is made out in a few decades?

Something that is not at one level at all!

Different from the bamboo wood pulp used to make paper at this time, wood pulp only accounts for half of the raw materials of banknote printing paper, and the remaining ninety percent is cotton linters. In today's Datang, only Gaochang has cotton wool, and most of the cotton in Datang is used for officialdom. So in terms of raw materials, it can actually be controlled.

Cotton linter is also called 'cottonseed lint', which is the residual fiber on the wool cotton seed after cotton ginning.

Because the nutrients are easier to transport to the linters, the content of cotton linter cellulose far exceeds that of normal lint, so it is used to make paper with full toughness, difficult to tear and not afraid of water...... In addition to being used as coinage paper, it is also the main raw material for nitrocellulose.

Moreover, Li Mu also added an appropriate amount of lime powder to the cotton pulp of papermaking. This lime powder is amazing, not only can it be used to burn cement, but it can also eliminate the acidic substances in the paper, making it acid-free paper!

The reason why the paper loses strength and fades is because of the acidic substances, and after neutralizing it with calcium carbonate, the so-called permanent paper can be obtained, making the paper more solid and flexible without fading.

This 'cotton acid-free paper' has a delicate transition layer during printing, and the expressiveness of the texture coating is excellent, and it can print more complex and delicate patterns, which is beyond the reach of other papers at this time.

Rome wasn't built in a day, and cotton acid-free paper wasn't made in a day.

In fact, when Li Mu was still in Lantian, he had already asked Feng Si to send a few paper-making craftsmen to secretly develop this kind of pure cotton acid-free banknote printing paper in Yali, Lantian County. Something that is not at one level at all!

Different from the bamboo wood pulp used to make paper at this time, wood pulp only accounts for half of the raw materials of banknote printing paper, and the remaining ninety percent is cotton linters. In today's Datang, only Gaochang has cotton wool, and most of the cotton in Datang is used for officialdom. So in terms of raw materials, it can actually be controlled.

Cotton linter is also called 'cottonseed lint', which is the residual fiber on the wool cotton seed after cotton ginning.

Because the nutrients are easier to transport to the linters, the content of cotton linter cellulose far exceeds that of normal lint, so it is used to make paper with full toughness, difficult to tear and not afraid of water...... In addition to being used as coinage paper, it is also the main raw material for nitrocellulose.

Moreover, Li Mu also added an appropriate amount of lime powder to the cotton pulp of papermaking. This lime powder is amazing, not only can it be used to burn cement, but it can also eliminate the acidic substances in the paper, making it acid-free paper!

The reason why the paper loses strength and fades is because of the acidic substances, and after neutralizing it with calcium carbonate, the so-called permanent paper can be obtained, making the paper more solid and flexible without fading.

This 'cotton acid-free paper' has a delicate transition layer during printing, and the expressiveness of the texture coating is excellent, and it can print more complex and delicate patterns, which is beyond the reach of other papers at this time.

Rome wasn't built in a day, and cotton acid-free paper wasn't made in a day.

In fact, when Li Mu was still in Lantian, he had already asked Feng Si to send a few paper-making craftsmen to secretly develop this kind of pure cotton acid-free banknote printing paper in Yali, Lantian County.

Ordinary people can't receive every silver ticket, so they go to the bank to check the authenticity. When I turned around and found that I had received a fake silver ticket that couldn't be exchanged for silver, I must have blown up my lungs.

There are many such things, who would dare to collect cash tickets and use silver tickets in daily trading? The idea of the silver ticket to implement the whole country will also die.

If he can't grasp the right to issue banknotes, what is Li Mufei so hard for?

……

Li Mu asked Feng Si, just to understand the current level of anti-counterfeiting, but in fact, he had already made preparations.

"I also have some preparations here, you can take a look and see if you can make a replica." Li Mu said this, but his expression was in his chest, and he took out a few pieces of white paper from his arms and put them on the table.

Feng Si is an industry insider, dealing with paper every day, seeing the paper that Li Mu took out, he couldn't help but light up, and quickly looked at the paper carefully. When I turned around and found that I had received a fake silver ticket that couldn't be exchanged for silver, I must have blown up my lungs.

There are many such things, who would dare to collect cash tickets and use silver tickets in daily trading? The idea of the silver ticket to implement the whole country will also die.

If he can't grasp the right to issue banknotes, what is Li Mufei so hard for?

……

Li Mu asked Feng Si, just to understand the current level of anti-counterfeiting, but in fact, he had already made preparations.

"I also have some preparations here, you can take a look and see if you can make a replica." Li Mu said this, but his expression was clear