In fact, the paper materials of later coins are mainly cotton, linen, fiber filaments and colored dots, metal wires, opaque plastic threads, and fluorescent threads with long fibers.

In addition to the plastic thread, which cannot be made for the time being, it is not difficult to do anything else for the current Daqin.

Cotton, linen, Daqin are all available, metal wire, according to the denomination of the coin, Li Yang planned to use copper wire, silver wire, and gold wire respectively. Fluorescence, in fact, is rare earth, which belongs to inorganic materials.

Under Li Yang's design, Daqin banknotes, directly imitating the banknotes of later generations, do not engage in any colorful rich colors, according to the single gray tone of the dollar, because Daqin was originally also respected by dark colors, so choose light ink printing, with light green patterns, it will be more natural and simple.

As for the monetary unit of the Great Qin banknotes, Li Yang also discussed with everyone in the State Council and decided to use the Qin knife as the monetary unit of the Qin coin. Because since ancient times, the Chinese currency is dominated by shovels and knives, even in the Qin period, knife-shaped currency was also popular, until Qin Shi Huang unified the copper coins in the outer circle as currency, there was no knife-shaped currency.

After the unification of Qin Shi Huang, the copper coin was a plant.

However, Li Yang thinks that the unit of the plant is too small, so he thinks that on top of the unit of the plant, the unit of "knife" should be added, such as one Qin knife and one hundred Qin knife.

In this way, not only does the currency have a larger unit, but even the old money (copper coins with a circle on the outside and a square inside) can continue to be used. Ten copper coins, converted into a knife of Daqin banknotes.

In Li Yang's words, the copper coins of the past have almost been reduced to the coins of later generations.

In this way, Daqin does not need to print small denomination change, which can be regarded as saving financial and material resources, and it is also a convenience for the people.

To buy groceries, use copper coins directly.

When buying large items, paper money is used.

Li Yang's idea made everyone praise it.

Of course, Li Yang had thought about using the currency unit of "yuan" directly.

However, when I think about it, I don't think it's right.

Because there are two popular theories about the reason for the "yuan", the monetary unit of later generations: one theory believes that the appearance of "yuan" in currency began in the early Tang Dynasty. Tang Gaozu abolished the five-baht coin and changed it to "Kaiyuan Tongbao". "Kaiyuan" means to open up a new era. In the 26th year of Guangxu of the Qing Dynasty (1900), at the same time as the minting of silver dollars, Guangdong began to manufacture mechanical copper dollars, and the issuance of copper dollars in the Qing Dynasty laid the foundation for today's currency name "Yuan". Due to the expansion of exchange, people urgently needed lighter money to replace silver dollars and copper dollars, so banks printed a kind of exchange vouchers for silver dollars and copper dollars, and the nominal value of this exchange voucher was the same as the actual silver dollar and copper dollar, and gradually the exchange voucher evolved into paper money.

Another theory holds that the use of "yuan" as a monetary unit began during the Wanli period of the Ming Dynasty. At that time, the most popular currency in Europe and the United States, the "silver dollar", began to be introduced to China, the most popular is the Mexican silver dollar, the money has the pattern of an eagle, so it is also called the eagle ocean. It is named because it is made of silver and has a round shape, and one piece is called a circle. The word "circle" is both the name of the currency and the name of the unit. For the convenience of writing, people later replaced "yuan" with the homophone "yuan" of round characters.

However, no matter what era the "Yuan" came from, it is currently the Qin Dynasty, and this Yuan is not easy to accept. The "knife" as a currency from the Zhou Dynasty, to the Spring and Autumn Period and the Warring States Period, and even the early Qin Dynasty, is more suitable.

This is the reason why Li Yang uses the "knife" as a unit of currency.

Once the monetary material has been chosen, the monetary unit is also available, and then the face value and pattern are present.

The face value is divided into 1 Qin knife, 2 Qin knife, 5 Qin knife, 10 Qin knife, 20 Qin knife, 50 Qin knife, and 100 Qin knife, a total of seven denominations.

And the pattern naturally can't be difficult for Li Yang.

He sketched it out on paper.

In the center of the obverse is the head of the First Emperor, to show his respect, and the four corners are face values, with fluorescent lines; The pattern on the back, with the face value in the center, the four corners are still the face value, and the metal wires are matched, so that a rough design sketch similar to the banknotes of later generations comes out.

For this design, not only Fusu, but also everyone in the National Council is very recognized.

Joke, this is an advanced design that has been recognized by countries around the world, how can they find fault with it?

Of course, paper money is worthless because it is not valuable, unlike copper and silver, it has value, so the most important thing for paper money is to prevent counterfeiting, so that others do not easily counterfeit.

And in order to prevent this, this banknote obviously cannot be too casual and too simple.

For example, the face value of the portrait of the First Emperor can be made into watermarks of different thicknesses or depressions.

Another example is to set up some encoding.

Or set a standard for the modulation ratio of fluorescence and the modulation ratio of ink, so that others cannot easily modulate the same color ink.

The proportion of ink is different, and the natural color of the printed things is different, which can give people the feeling of counterfeit banknotes at a glance.

In addition, Dong Peng also put forward many suggestions to prevent counterfeit banknotes.

For example, the engraving technicians must be registered, especially the engraving masters in the mint, their conduct must be reviewed, and at the same time, laws related to counterfeiting must be introduced to deter them.

After all, the first condition for printing counterfeit money is the production of engraving plates.

Li Yang still highly agrees with this.

Printing, papermaking, and general work have ready-made workshops, and the workers are already very skilled.

Therefore, the mint is directly composed of the relevant workers who will be the government.

When the pulp is made through the copper wire mesh to make paper, according to the different shades of the copper wire, the paper presents different thicknesses or depressions, that is, the watermark of various portrait graphics is formed. In this way, the banknote will not be a smooth piece of paper, but a dense watermark, like a human fingerprint.

At the same time, the position of the watermark on the banknote paper is not the same, and it can be divided into a fixed position watermark, that is, a watermark made at a fixed position on the banknote; Semi-fixed position watermark, made on a certain part of the ticket face, presenting a continuous watermark; There are also watermarks that are not fixed, such as watermarks on the entire banknote.

In addition, in the production of paper, the inlay of copper, silver and gold wires makes the paper look very forced.

Finally, with the printing of ink and the use of phosphor, the whole banknote is printed, which is not only beautiful, but also has a good anti-counterfeiting effect.

In Li Yang's words, this thing simply represents the advanced technological level of the Qin State at that time and even the world.

After all, this combination of printing, papermaking, chemistry, art, craftsmanship and other combinations is destined to the present world of Daqin banknotes, which will be exquisite.