After seeing His Majesty Li Er and Empress Changsun, Lu Heng did not rush to leave the palace.

He talked to Li Mingyu and went to the East Palace alone.

Compared with the lively Lizheng Hall, the East Palace where Li Chengqian lives is very deserted.

"Brother Gao Ming, why are you doing here alone?"

The eunuchs and palace maids at the entrance of the East Palace already recognized Lu Heng. He greeted these people and quietly entered Li Chengqian's study.

Li Chengqian was writing something at this time, but suddenly he was shocked when he heard his voice.

"Why did you come into the palace?"

He stood up with some difficulty and walked slowly towards Lu Heng with a cane:

"I originally planned to find you these two days, but because of Xiao Yu's incident... As the prince, I was not easy to come forward, so I could only ask someone to say hello to Duke Dai."

"I heard that it has been resolved?"

In fact, Li Chengqian felt a little guilty when he saw Lu Hengshi today.

After all, they have such a good relationship.

When a friend was in trouble, he was the prince, and he was inferior to tens of thousands of people, but he could not come forward to help him speak. He felt ashamed of his feelings and reason.

Lu Heng patted his shoulder for nothing.

"I caused the matter, how guilty are you!"

"Besides, I want to thank those aristocratic families for their work. If it hadn't been so big, your father wouldn't have agreed to my marriage with Yu'er."

Li Chengqian still waved his hand a little guiltyly.

But after a few seconds, he immediately reacted!

"Have you told my father about this?"

"The father had already negotiated a engagement with Tang Jian. At this time, he changed his mind. It was difficult for the father to do it... Why did he suddenly let go?"

Li Chengqian looked at Lu Heng suspiciously:

"You didn't use any evil ways, did you?"

After all, he was the crown prince of the dynasty. When Li Chengqian was considering things, his best attitude was to start with the emperor's mind.

The most important thing about finding a princess is not the character of the princess, but the family background behind him. Even if he finds a bad person, the princess has the right to divorce and remarry.

But generally speaking, everyone plays their own games.

Even if the relationship is not good, you will not easily divorce, otherwise it will hurt the relationship between the royal family and the prince-consort family.

Obviously, Li Shimin liked Tang Shanshi only because Tang Shanshi had a good father named Tang Jian.

No matter how you look at it, Lu Heng’s importance cannot be comparable to Tang Jian!

"What do you think of!"

Lu Heng rolled his eyes and pulled Li Chengqian down loudly, making him look more like his master.

Seeing that there was no one around, he whispered:

"That printing yard was handed over to you before..."

“How is it going?”

After all, it took three months to be a refugee in the eastern suburbs. Lu Heng was worried that he might carry a virus, so he didn't go back to Chang'an City at all.

Li Chengqian was the crown prince. Even if the job was given to him in name, Li Shimin would not let the crown prince of the empire stand under the dangerous wall.

So, in the past three months, Li Chengqian only occasionally went to the eastern suburbs.

The matter of managing the movable type printing institute fell on him.

Speaking of this, Li Chengqian immediately became energetic.

“It’s going very well!”

"In just a short time, they have been able to print out the Four Books and Five Classics in batches!"

"It's just...it seems that it's not realistic to sell all these books to poor families."

Lu Heng frowned.

He asked back:

"Where is the problem? We have books originally, and there are a large number of shops that can be used to build bookstores, and there are countless poor families."

"There is both supply and demand, so it should be sold well."

Li Chengqian sighed.

"I didn't think of this problem before."

"Brother, we have never lacked money and we can't even notice the most important point."

"The reason why books are expensive is that they are rare and secondly because they are expensive!"

"Even if we can print out thousands of books... but the paper costs are high, we can't do a loss-making business, right?"

Lu Heng fell into silence for a moment.

He really never thought that the first difficulty of eliminating illiteracy was that paper was too expensive!

After a while.

Lu Heng suddenly walked to Li Chengqian's desk, picked up a stack of papers and flipped through them.

To be precise, this should be called a knife paper.

He shook at Li Chengqian:

"Are all the paper used for printing?

Li Chengqian smiled bitterly and shook his head:

"Of course not."

"The paper here in Brother Wei should be the best in the world. Although I don't know the specific price, the printing institute's use must not be comparable to this one."

Lu Heng raised his eyebrows:

“Then why not print on cheap paper?”

"Although I haven't read any books, I've seen paper."

"In addition to this expensive rice paper, there should be many cheap straw paper, hemp paper and other things that can be used. Why do you have to use rice paper?"

This sentence not only truly exposed the fact that Lu Heng was a semi-illiterate in the Tang Dynasty, but also successfully shocked Li Chengqian.

His Highness the Crown Prince was so shocked that he almost stopped lame!

"Straw paper is like toilet chips. It is used in the toilet. How can it be used to write?"

Li Chengqian covered his face:

"My brother, you have some common sense!"

Lu Heng doesn't feel that he has no common sense.

After all, he was a modern person, and in his own era, there was no problem of not being able to afford paper.

Who knows that the paper from the Tang Dynasty is thick, hard and expensive!

Why!

Lu Hengda was puzzled from the bottom of his heart:

"Why can't it be used to write?"

"Aren't it all paper? Your rice paper is no different except for the thicker and whiter."

Li Chengqian was helpless.

He had no choice but to explain:

"It makes sense that rice paper is expensive."

"If those straw papers are used to write and paint, they can't bear the strength, and they can easily soak the ink behind them."

"When you're smudged, nothing you can't write is very useful because you can't see clearly."

"If you really want to use it for printing, you may end up being useless."

Lu Heng pondered for a long time and tried hard to retrieve the process of papermaking from his own science and engineering memory.

Finally, he remembered a documentary he had watched.

"Rice paper is expensive, because the process is complicated, and the papermaking technology of rice paper is only in the hands of a small number of people."

"I have another way here, to make paper that is almost as thin as straw paper, but is perfect for writing and printing."

"Why don't we try it, papermaking, printing in one-stop..."

"Get out some big things!"

Li Chengqian was a little confused.

A second ago, Lu Heng had no idea why straw paper could not be used to write.

In the next second, you can actually take out a brand new papermaking technique?!

What a turning point!

He asked carefully:

"What paper are you talking about?"

Lu Heng smiled slightly:
Chapter completed!