Liu Dahe said: "Yes, every time the length of this flat glass increases, the difficulty of making it increases several times. There are as many as there are below ten centimeters, and you can't make a few pieces of this kind in a year. ”

This is not a lie, human beings have mastered the production method of glass for thousands of years, but it was not until the fifties of the twentieth century that the method of industrial production of flat glass was invented.

It's float glass.

(I won't talk much about this technique, if you are interested, you can search for it yourself.) ）

Prior to this, humans could only make small pieces of flat glass, that is, they first blew the glass solution into a bottle, cut off the ends with scissors, cut them from the middle, and then unfolded.

This method can only make about 10 centimeters of flat glass, no matter how big it is, because it can't blow out such a large bottle.

The method of making large pieces of transparent flat glass is very troublesome, and the glass solution is first crushed into a flat shape with a roller.

The flat glass produced in this way is covered with ripples, similar to the surface of a lake blown by a gentle breeze.

The next step is to polish all the corrugations by hand, and it takes at least 100 hours for even the most skilled workers to polish the glass to the test.

If you accidentally break the glass in the middle, all the effort you have spent before will be in vain.

So until the fifties of the twentieth century, large pieces of flat glass were still luxuries, and only the richest and richest could enjoy them.

It was not until the advent of float glass technology that human beings were able to assemble the production line of flat glass of any specification, and then the flat glass became a cabbage price and was popularized to ordinary people.

The technology of float manufacturing flat glass is very complex, and even if you know the full set of technology, you need to have the industrial system of the Second Industrial Revolution to make it.

What's more, Wen Yi didn't know that kind of technology yet, so he could only use the most primitive method to make flat glass.

He made a mirror from flat glass, and he used tin foil mercury to complete the silver mirror reaction.

Long-term exposure to lead can cause lead poisoning, and mercury evaporation can also cause poisoning, and Wen Yi used a relatively stupid method to deal with this situation.

Make a frame of gold, silver or copper to seal the glass mirror, plug all the gaps with glue, and stuff some sulfur powder into the frame.

Sulfur can absorb evaporated mercury to form mercury sulfide, which can effectively eliminate mercury hazards.

Otherwise, he would not have taken out such a harmful thing, let alone give the mirror to his daughter-in-law.

Jin Rushan doesn't care about the production method of glass, and he doesn't dare to care, as long as he knows that he can make mirrors of about ten centimeters in batches.

A mirror of this size is a weapon to break into the aristocratic market, and the kind of mirror that is more than one meter big is more of a gimmick.

……

Baekje Daoxian City, Lee Kwang is sitting at home drinking stuffy wine.

His ancestors were Han Chinese, and after the Yongjia Rebellion, the Jin family fled south, and the territory in Liaodong became fat in the eyes of foreign races.

In order to protect themselves, the Lee family took refuge in Baekje, and although it was dishonorable, they finally saved the lives of the family.

His grandfather became a petty official by voluntarily surrendering, and when his grandfather died, the family became a commoner, and he could only rely on the capital left by his ancestors to become a businessman.

Baekje is a country founded by the Buyeo people, and the status of the Han people is not high. Therefore, they do not dare to do business locally, otherwise they will be devoured by the local elites.

Sea trade became the only choice, although it was very dangerous and hard, and finally allowed the whole family to live a prosperous life.

When he took over the family's business, relying on his courage and vision, the business became bigger and bigger, and the original two broken ships became five large merchant ships.

A trip abroad can make a lot of money, although a large part of the relationship has to be taken out, but the rest is enough to make him rich.

He is not satisfied with being a rich man, being an official is the real way out. He is ready to use all his strength to send his son to officialdom.

Just as he was planning it all, the unexpected happened.

"Tang Guo, where are you?"

Yes, the accident came from the Tang Kingdom, and he traded with the Tang people twice, and the commodity was grain.

The biggest hard currency in this era was grain, and Baekje was also short of food, especially in recent decades they have been fighting with Goguryeo, and the demand for food is even greater.

He thought that he could rely on these grains as a stepping stone to send his son to a career.

His plan did succeed, and the eldest son entered the city department as a petty official.

This is the department in charge of the market, trading, and capital management of Baekje, and it just so happens that his family is also in business, so they can help each other.

But he soon found out that the situation was not right, and the chief of the metropolitan department gave his son an order to find Tang Guo to buy more grain.

The chief governor did not say the consequences of not being able to buy food, but how could Li Guang not know the way these people behaved.

But he really didn't know where Tang Guo was, and he didn't have the contact information of the other party, so he had no choice but to send the boat out to the sea to try his luck.

That's the way it is, you can often see each other when you're not looking, and you can't even see a figure when you deliberately look for it.

It's been more than a month, and I have heard a lot of true and false news, but I have never been able to contact the people of Tang Guo.

Just today, the chief of the chief 'understood' his son Li Zheng's fatigue from work, so he asked him to come back and 'have a good rest' for a few days.

He knew that the other party was giving him an ultimatum.

After taking another sip of stuffy wine, Li Guang smiled bitterly: "Alas, where blessings and misfortunes lurk, the ancients did not deceive me." ”

Li Zhengquan said: "Dad, don't hurt your body by drinking, our family still depends on you at the helm." ”

Li Guang put down the wine bowl and said, "I have prepared a boat, you can take a boat to the Jin Kingdom tonight." ”

Li Zheng shook his head and said, "You are really drunk, neither of us can run away, let's let the second brother go." He is more familiar with the Jin people, and it is easier to settle down there. ”

Li Guang naturally knew that the two of them couldn't run, and he just said this just to test him, after all, he couldn't send his second son away without Li Zheng's consent.

Now seeing that Li Zheng agreed, he didn't feel a little relaxed in his heart, but even more painful: "Alas, it's my father who is sorry for you." ”

Li Zhengdao: "You gave birth to me and raised me, and gave me everything I have now, and I am sorry for you." ”

When the father and son were exchanging their hearts, they saw a young man in his early twenties rushing over: "Dad, big brother, good news, good news, the Tang people have found it." ”

Li Guang and Li Zheng were ecstatic and said, "Really? Where are the people? ”

The person who came was Li Guang's second son, Li Feng, who took a breath and said, "Their ship is in the nearby sea. ”

Li Guang said excitedly: "Okay, good, it's really good, Feng'er, you saved our whole family." By the way, where did you find them? ”

Li Feng shook his head and said, "I didn't find them, they took the initiative to find me, saying that they had a big business and wanted to talk to us." ”

"And it seems that they also have a big steward, and the aura is very big."