According to the time, Li Mu should have returned to Luoyang. The shipyard in Luoyang is waiting for him to start construction. The parts of each branch have basically been built, but who dares to assemble a ship as big as ten thousand stones before? If you can't install it, the responsibility is too great. The labor and materials consumed before and after will be at least hundreds of thousands of yuan. Even the master dares not take this risk.

Ma Zhou had sent letters several times, urging Li Mu to return to Luoyang as soon as possible. Li Mu also wanted to go back, but the matter in Chang'an had not been handled yet, so he had to stay for a few more days.

What Li Mu said was not about marriage, but for him, this incident could only be regarded as a small episode.

The problem Li Mu wants to solve is the bank's problem. The transactions he made with the Wang family in Taiyuan also included them.

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

Therefore, glass chips are not a currency ideal in Li Mu.

Paper money, or paper money.

Now that the glass chips have been accepted, the matter is half completed. At least he no longer needs to explain to the people how banknotes are used. Just like glass chips, it can solve the problem.

The biggest problem facing banknotes is anti-counterfeiting.

There is no absolute anti-counterfeiting in this world. Even in the era before Li Mu traveled, there was still a part of the currency circulating on the market. All countries wanted to eliminate counterfeit banknotes, but the facts proved that this could not be eliminated. It was not until online payment became popular 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 done better. But he now has a unique advantage. That is, his knowledge beyond thousands of years, and he used all the anti-counterfeiting methods that hundreds of years later. It would take at least a few decades for people to crack them.

Li Mu thought that he would have become a trash in decades. By then, no matter how flooded it is? Children and grandchildren have their own blessings, and they will not worry about that time.

Anti-counterfeiting of paper banknotes requires two aspects: one is the material of the banknotes, the other is the printing method, and all anti-counterfeiting methods can be classified between the two. For anti-counterfeiting of paper banknotes, a lot of experience has been accumulated when printing Chang'an bills before.

When making paper, the thick changes of the pulp are different, and watermarks can be made. Ordinary anti-counterfeiting, watermarks and dark notes are enough to deal with. First, the process of making watermarks is not something that ordinary paper mills can do. Furthermore, only internal personnel know the secret notes. Even if they can be technically forged, secret notes are mostly unforged. If they can be forged, it is a ghost. There are not many people who can contact these secrets in the bank, so it is easy to find them.

This anti-counterfeiting technology can almost prevent 80% of the counterfeiting on the market. But this is far from enough. In order to make a decision, Li Mu came up with another magic weapon, which is simple, just a seal.

Ancient seals were not printed on later e-commerce platforms. Laser burning, no matter how many are made, they are exactly the same. Seals carved by hand with carving knives, because the traces of the carving knives passing on the stones cannot be the same, and they naturally have anti-counterfeiting effects.

It is difficult to imitate it with two-pronged approach. But even so, it is still not perfect. Because whether it is watermark or seal engraving, it must be a certain level of inspection to see it. If it is operated in a bank, there is definitely no problem, but what if it is a private transaction? It cannot be guaranteed that every ordinary person can verify it clearly, right? Therefore, there must be a means that ordinary people can see it at a glance.

Li Mu asked Feng Si today to ask him if the current methods of making paper can provide new ideas.

Feng Si was one of the first people to follow Li Mu. He devoted himself to papermaking and had no contact with others. He did not appear in front of Li Mu many times, but he could basically complete the tasks assigned to him by Li Mu.

This is a good person who is easy to study. Others give up after failing a few times, but his dictionary does not give up on the word "this" is easy to study and it depends on time to study it.

"Mr. Marquis, the villain's idea is to start with technical means," as he said, he took out a piece of paper and placed it in front of Li Mu, saying, "Mr. Marquis, please see, this is a new product of the paper shop, special hemp paper, this kind of paper is not sold on the market yet."

"There is also the same ink." Feng Si took out a small porcelain bottle and said, "This is the newly prepared ink, and the color is also unique."

Seal four handfuls of ink on the paper and said, "The latest paper, plus the latest ink, plus the original watermark and seal to prevent counterfeiting, the villain thinks it is safe to keep it safe."

Li Mu picked up the two things and looked at them, saying, "This is true in a short period of time, but this technology is just difficult to imitate, not to imitate. Our silver bills are not registered, we do not recognize people, and we pay the silver bills as soon as we see them. The anti-counterfeiting requirements are much higher than those of Chang'an tickets."

"This is not like a recognition of the vote and a person. With a reserved seal and secret seal, it is enough for people to forge it." Li Mu said in a deep voice: "But if our silver bills want to be circulated among the private sector without the bank, most of the methods are not used. We can only work hard to print the silver bills."

To meet the requirements of Li Mu, a decisive sign is that ordinary people must be able to distinguish the authenticity of the silver bill.

Don’t underestimate the people of the world. The Tang Dynasty has vast territory and too many craftsmen. Wang Xizhi’s Lanting Preface can make a fake one, let alone a small silver note?

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

As long as this thing is made by a person, there must be another person who can make it. The role of silver notes is money. Driven by huge interests, countless people will definitely take risks. If they cannot tell it, the ultimate loss will be the bank, and the credibility will be lost.

You have to kill danger in the cradle!

We will not let the fake masters be discouraged and dispel the idea of ​​fake. I believe that countless fake silver notes will soon flow into the market.

The common people could not receive every silver note, so they went to the bank to check the authenticity. When they turned around, they found that they had received fake silver notes that could not be exchanged for silver, and they would definitely be furious.

If there are too many such things, who dares to check cashiers and use silver notes in daily trading? The idea of ​​silver notes will also die if it implements a national concept.

If you can't control the right to issue money, why is Li Mu's effort so much?

...

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

"I have some preparations here too. Come and see if it can be imitated." Li Mu said this, but his expression was clear. As he spoke, he took out a few pieces of white paper from his arms and placed it on the table.

Feng Si is an industry insider who deals with paper every day. When he saw the paper Li Mu took out, his eyes lit up. He quickly looked at the paper carefully. As soon as he bought the thing, Feng Si couldn't help but exclaim: "It feels so good, it's very shaved."

“It’s really tough.”

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

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

"I can't even tear it apart. How did this paper be made?"

Li Mu refused to answer, and asked someone to bring a basin of water and soak the paper in the water.

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

Finally, I took out the fire twister and burned a piece of paper. But the result was that it was just smoke and coke, but there was no fire...

"I believe that no one can imitate this kind of paper within decades." Feng Si was completely convinced and said, "If you use the silver notes to print them, it should be the most appropriate one."

Of course it is appropriate. This is the printing paper that Li Mu tried to test out after he wasted a lot of effort. Although it is incomparable to the banknotes he had traveled through time, it is at least one thousand years ahead of this era!

If a thousand years of wisdom crystallization is created in decades, wouldn’t it be a joke?

It's not at the same level at all!

Unlike the use of bamboo and wood pulp to make paper at this time, only half of the raw materials for printing money paper, and the remaining 95% of the used cotton velvets are used. In today's Datang, only cotton velvets are available in Gaochang. Most of the cotton in the Tang Dynasty are used for officialdom. Therefore, the raw materials can be controlled.

Cotton velvet is also called "cotton seed velvet", which is the remaining fibers on the wool cotton seeds after cotton ginning.

Because nutrients are easier to transport into velvets, the content of cotton velvet cellulose is far greater than that of normal lints. Therefore, it is very tough to make paper, and it is difficult to tear and pull, and it is not afraid of water... In addition to being used as coin paper, it is also the main raw material for making nitroscopic cotton.

In addition, Li Mu added an appropriate amount of lime powder to the cotton pulp used in the papermaking process. This lime powder is very magical. It can not only be used to boil cement, but also eliminate the acidic substances in the paper and turn it into acid-free paper!

The reason why paper loses strength and fades is because acidic substances are at work. After using calcium carbonate to blend it, you can get the so-called permanent paper, making the paper more solid and flexible and not fade.

This kind of 'pure cotton acid-free paper' is fine when printing, and has excellent expressiveness on texture coatings. It can print more complex and fine patterns, which is beyond the reach of other papers at this time.

Rome was not built in one day, and pure cotton and acid-free paper could not be built in one day.

In fact, when Li Mu was still in Lantian, he had already asked Feng Situ to send several paper-making craftsmen to serve as his assistant in Lantian County, secretly researching acid-free paper. There was no ready-made one in the system, and Li Mu could only "disassemble" the formula. He experimented with himself and finally made a new formula.

Failures again and again failed to disturb Li Mu's enthusiasm. Finally, after more than 130 failures, he finally succeeded.

"Try writing a few words first, use this ink." Li Mu took out a small copper box and signaled Feng Si. Feng Si picked up the brush and found that the ink inside was sticky and shiny, which was completely different from ordinary ink.

"Do you need to mix water?"

"Use it directly." Li Mu said in a deep voice. Feng Si dipped it in a copper box with a brush as he said, and then wrote a line of words on pure cotton acid-free paper.

"Tang Dynasty Baochao!" This is the name given to the silver bill by Li Mu. Feng Si didn't know what to write, so he wrote this.

"The colors are bright, symmetrical, and not melted, which is indeed suitable." Feng Si gave his own judgment.

He could feel that the ink was different, but he couldn't tell what was different.

In fact, this is oily ink, similar to the signature pens of later generations. The characters printed with water-based ink are afraid of water and easily dissipated. Oily ink is not only not afraid of water, but also makes the printed materials show a strong, uniform color and a strong luster.

The manufacturing method is also very simple, and there is a special formula in the system, which is not a problem.

It is almost impossible to imitate pure cotton acid-free paper-free ink, plus watermarks and seals with the current technical level of Datang.

After completely no longer worrying about anti-counterfeiting, I can finally focus on the layout design of the silver note.

Li Mu's painting skill tree had not yet opened, and he had not decided to imitate whom he wanted to imitate, so he simply gave up his own design and found Wang Ou to act as his royal painter.

"Around the silver note, use two straight lines, one thick and one thin, to frame the edges. Patterns should be drawn at the four corners, the more complex the better."

"Write the four words "Dang Tang Bank" on the top, put a long frame in the middle, write it and pay the full ten taels of silver with the ticket... Is it better to write ten taels of silver? Or is it better to write ten taels of silver? Forget it, let's write ten taels of coins. Now the people mainly use copper coins." Li Mu asked Wang Ou to fill in the necessary information, squandered all the inspiration, and asked: "You can freely draw some patterns in the blank space, but what are some good suggestions?"

Li Mu, who was used to using money in his previous life, had the first idea in his mind, to get Li Shimin's avatar.

But thinking about Li Shimin's appearance now, if he really painted it, the money would be too much like a "Tiandi Bank". Think about it, let's just forget it.

Printing your own avatar? Li Mu hasn't lived enough yet.

Suddenly, a wonderful thought came to my mind. Li Mu pointed to the blank space and said, "Draw the four algorithms, four denominations, addition, subtraction, multiplication and division, just right!"

Wang Ou was stunned and immediately remembered the past of talking about the four calculations with Li Mu in the Craftsman's Workshop. The two had not expressed their feelings at the time, but she had fallen in love with Li Mu at first sight.

Thinking of this, his pretty face turned slightly red, and according to Li Mu's requirements, he drew the symbols of the four algorithms one by one.

"The back is drawn, what pattern should be needed on the front?"
Chapter completed!