In a dozen boxes, there are ten boxes of white paper.

This is the product of the papermaking workshop that Li Yuanjia left for his younger brother, and because every time Wang Pu completes the technical update, he will sort out a document and send it to Luzhou, so that the papermaking workshop there can be updated synchronously, and the quality of the white paper is just a little worse.

Every once in a while, Li Lingkui would ask people to send a batch to Chang'an.

Li Yuanjia's younger brother is a real "elegant man", good at music and rhythm, studious, and ...... Of course, many Tang princes in the history books, especially Li Yuan's sons, seem to have the same evaluation. After all, it is the top family in the world, and it is not a son-in-law, so it is normal to be good at poetry, calligraphy, painting, music and rhythm.

And Li Lingkui is not a traverser, so he perfectly realized the wishes of Yuwen Zhaoyi and Yuwen Shiji.

It's low-key and easy to satisfy.

So although under the persuasion of his brother, Li Lingkui did not close the paper workshop, and he was quite happy that he could use the paper made by his own family in the future, but it was impossible to expect him to take out the extra paper every month and sell it - compared with Li Yuanjia, Li Lingkui's head is the prince of this era, and he is stubborn and terrible in some aspects!

If you make too much, you can send it to Chang'an.

This time, the things that Li Lingkui sent to Chang'an had the blank paper accumulated in the past two or three months. He is not interested in doing business, and naturally he has no intention of expanding the paper workshop in Luzhou, so he can only produce two or three more boxes in a month.

And for Sun Peng, these blank pieces of paper are better than nothing.

Merely......

What can make him wide-eyed, and at the same time overjoyed, is not these ten boxes of white paper, but the black things in the other boxes, which are in stark contrast to the increasingly snow-white Han Wang paper!

"It's ...... Charcoal? ”

didn't notice the change in Li Yuanjia's expression, but Fang Fengzhu saw the contents of the box, and leaned down slightly with some curiosity.

It's just that while saying these words, Fang Fengzhu's expression was a little strange.

Of course she recognized the appearance of charcoal, after all, when she was a child, her family used charcoal basins to keep warm, until Li Yuanjia sent coal stoves and briquettes. But the boxes of charcoal in front of him looked quite strange, different from anything Fang Fengzhu had ever seen!

And......

The King of Xu in Luzhou, why did he have to send several large boxes of charcoal all the way over?

"No, it's not charcoal."

Just when Fang Fengzhu was puzzled, Li Yuanjia, whose heartbeat was suddenly accelerating, denied it in a somewhat trembling voice: "This thing is called coke, and it is a completely different thing from charcoal!" ”

"Coke?"

Stunned for a moment, Fang Fengzhu subconsciously tilted her little head.

A blank face.

"Yes, Coke!"

Taking a deep breath, Li Yuanjia desperately wanted to suppress the ecstasy in his heart, and said in a calm tone as much as possible: "Charcoal is made of wood, and coke is made of coal...... I tried it in Luzhou before, but I never made it, and when I left, I told Lingkui to let them continue, but I didn't expect it...... I didn't expect it! Hahaha......"

The efforts did not bear fruit, and Li Yuanjia finally couldn't help laughing!

He himself almost forgot that he had left this foreshadowing in Luzhou, but he didn't expect those guys to really make coke! Moreover, since they dare to send themselves several large boxes of finished products, it means that Luzhou has thoroughly mastered the method of producing coke!

No matter how complex the process, how inefficient it is, or how good the quality of the coke is, they have made it after all!

Oh my God, what a surprise!

Only Li Yuanjia himself knew how pitty he was doing, that is, he found a few craftsmen who made charcoal, and then told them the principle of coke production - high-temperature dry distillation in isolation from air, which is basically the same as the principle of charcoal production. Throwing away such a principle, and then giving these craftsmen some craftsmen and raw materials every month, they began to try to make coke.

There is no doubt that this is extremely irresponsible.

After all, charcoal has been used by humans for an unknown amount of time, but the coke thing should not appear until a long time later, and all a few craftsmen know is Li Yuanjia's few words.

As a result, with these few words, those craftsmen actually got the coke out!

How could Li Yuanjia not like it?

The fuels used in human smelting, from charcoal to coal and then from coal to coal, will have a significant impact on metallurgy every time. The temperature of charcoal is low, the duration is short, and it is not easy to master the heat; Although the combustion temperature of coal is high and lasts for a long time, it is easy to break after heating, and the sulfur content is too high, which is easy to affect the quality of pig iron.

In contrast, coke has the advantages of both, but not their disadvantages, and has been used since the day it appeared and has been used until the twenty-first century!

The four major raw materials for ironmaking in the future: ore, limestone, coke and air, coke is the latest to appear, but for Li Yuanjia, it is the most important!

Without him, Datang would lack this thing now!

Air is free, iron ore and limestone are naturally occurring and can be found with time, except for coke, which craftsmen have found in the long hours they have spent working with coal. And the appearance of Li Yuanjia has advanced this process by hundreds or even thousands of years!

This meaning is naturally extraordinary.

So finding coke from the things sent by Li Lingkui, you can imagine Li Yuanjia's mood at this time, it was like discovering a new world!

And his strange performance suddenly surprised Fang Fengzhu's heart, and after taking a closer look at the black thing in the box, he asked curiously: "King, is this coke very useful?" ”

"Haha, of course!"

Nodding without hesitation, Li Yuanjia said happily.

A good thing that can increase the production of pig iron and even steel, do you say it is of great use? Once this thing can be produced on a large scale, it will definitely make Datang's pig iron output skyrocket!

So even if we know that we can only make coke now, it may be a long time before craftsmen can skillfully use it and apply it to ironmaking, and the constraints of other raw materials such as iron ore will also have a great impact, but as long as it appears, will the rest be far away?

After all, Datang now has him as the king of Han, as long as he is willing to spend money and time, there will always be hope.

While thinking in his heart, and then looking at the still unsatisfied curiosity on Fang Fengzhu's face, Li Yuanjia smiled: "You can't see the usefulness of this thing in a short time, but I have to tell you that the usefulness of this thing is really much more useful than those blank papers......"