"King, so far, we have tried hundreds of combinations."

After holding a mirror in Li Yuanjia's hands, Han Cheng said respectfully: "But it has always been difficult to achieve the level you said, to be able to shine a fine picture of people's faces...... This is the piece that works best! ”

"Hmmm......"

Raising the mirror in his hand and looking at it, Li Yuanjia frowned slightly.

It's ugly!

Let's not say that this mirror is black and yellow, and the faces inside are blurry and almost at the same level as the bronze mirror, let's just say that there is ......

Blinking, Li Yuanjia shook his head and said, "Tsk, this is too uneven, isn't it?" ”

"Yes, it's uneven."

Swallowing hard, Han Cheng smiled bitterly: "We have tried many methods, but we have never been able to spread them evenly on the glass...... But don't worry, we will continue to work hard. ”

Although he was a little apprehensive in his heart, Han Cheng was not panicked. Because he is now slowly figuring out the king's character, it doesn't mean that you will be punished if you don't do things well, but as long as you do it with your heart, even if the result is not so good, at most it means two sentences...... More often than not, I get encouragement and help.

So this is the reason why Han Cheng and the others are more and more accustomed to leaving all kinds of test records, as long as all kinds of data are complete and true, the king will definitely not punish anyone after reading it!

"Hmm."

Sure enough, as Han Cheng expected, Li Yuanjia nodded and didn't say anything.

Han Cheng's method of making mirrors is very simple, that is, they melt all kinds of metals and then smear them on the glass—after solidifying, they can form a "film" that can reflect light.

The principle is simple, and it is cumbersome to operate.

The proposer of this method is, of course, the traverser Li Yuanjia, and the original statement was also an inspiration and thought of the idea of this Tianma action......

In fact, of course, it was not Li Yuanjia's imagination.

All the principles and methods come from the memories of his previous life, but it is a pity that his understanding of mirror making is limited to this principle, as for how to operate, or to the details of which metal should be used, Li Yuanjia is numb.

The only thing he knew was silver and mercury.

Two metals, one seems to be the material used in modern mirrors in the future, but if you think about it, you know that it must be very difficult to make, and I don't know if the ancient craftsmen can handle it; The other one is a little older, and Li Yuanjia's impression should be the material used by the Venetians!

Although I don't know how the ancient Venetians covered the glass with mercury, it should be right.

So from the very beginning, Li Yuanjia did not set his goal on silver.

He knew exactly how difficult it was...... For the future modern society, glass is an ordinary industrial product, no matter where you go, you can see it, and the price is as cheap as a glass bottle for only a few cents.

But just those pennies of glass bottles, in the thirteenth year of Zhenguan, Li Yuanjia dared to sell a thousand yuan!

That's right, at least a thousand!

You must know that now Han Cheng and the glass they produce, those pimples, covered with color spots and magazines, Li Yuanjia dares to shout the price of a hundred yuan, and there is no market, those powerful people can't buy it if they want to, let alone a pure and flawless glass bottle.

One for a thousand, it's all cheap......

Far from it.

In the time and space of Datang, it is too difficult to make perfect glass.

At least for ten years, Li Yuanjia didn't dare to think about the issue of purity, but just hoped that Han Cheng and the others could improve the process as much as possible and improve the quality of the glass.

If this is the case with glass, it is even more difficult for mirrors.

If you want to spread a thin layer of silver evenly on the glass, this is completely beyond the level of technology of the times, and it is impossible to become a palace in a short time.

The only hope lies in mercury.

But even so, Li Yuanjia did not dare to directly tell the craftsmen that mercury should be used to make mirrors, but told them the principles and methods, and let them try one by one, to trial and error.

By now, thousands of times have been smashed in.

Thinking about the money thrown in the water by the glass workshop in the past few months, the corners of Li Yuanjia's mouth twitched subconsciously, and he was very distressed.

No way, it's so expensive to engage in scientific research.

In order to ensure efficiency and quality, the glass workshop now uses charcoal...... At worst, you should use the best coke, both of which are more expensive. In addition, there are all kinds of metals, or minerals, which are also "luxuries" in this era, and if it were not for the accumulation of a lot of metal type workshops in the past, it would take a lot of time and money to collect them.

Not to mention that for these craftsmen, Li Yuanjia also has to provide a high-standard workshop and dozens of comfortable houses, which of these things does not cost money?

In this era, Li Yuanjia is willing to spend this money, because he knows very well how much money he can make for himself after the mirror comes out. If you change someone randomly, you definitely don't even think about this kind of thing.

Even if you know that mirrors are valuable, who knows how to "invent" them? And even if you know the principles and methods, with thousands of huge investments, how many people are willing to invest, or have this net worth?

"Alas, if only the emperor would be willing to invest."

Thinking of the guy who was still in Jiucheng Palace and unwilling to return to Chang'an, the corners of Li Yuanjia's eyebrows jumped a few times, and he was extremely unhappy in his heart.

When you are an emperor, your heart is too dark.

With his request and the efforts of Han Cheng and others, there are now more and more craftsmen in the glass workshop, and the output of glass is increasing every month, and it can rise to 200 yuan a month by the end of the year at the latest.

But most of the finished products produced were sent to Daxing Palace.

What can give Li Yuanjia a headache is that Li Shimin has not given a definite answer until now - the good-faced emperor said that he would not ask for his brother's glass in vain, and he would definitely give money at that time, but how much and when to give?

If people don't say it, Li Yuanjia doesn't dare to ask!

And what makes him even more helpless is that whether it is glass or a mirror that will be researched in the future, Li Yuanjia still has to think about how many dry shares to give the emperor!

People don't want it, but Li Yuanjia doesn't dare not give it.

After all, if this thing is really good and bigger, it will really become one of the top luxury goods in this era! Just these Tang magnates in Chang'an and Luoyang, how huge profits can they create for the glass workshop in a year?

Not to mention that in addition to Datang, is there a shortage of rich people in other countries?

Therefore, glass and mirrors will be a huge wealth, and if Li Yuanjia wants to protect them, they will be gold mines for the Han Dynasty in the next few decades or even hundreds of years.

But......

This gold mine is so big that Li Yuanjia doesn't dare to swallow it alone even if he is a prince.

Li Shimin, the eldest of the family, must share some of the past.

So when he thought that guy was only waiting to receive benefits, but never invested money, Li Yuanjia was full of unhappiness, and asked casually after flipping the mirror in his hand, "Han Cheng, have you tried mercury?"