The conscience of heaven and earth is really not Li Suque's conscience, so he only paid attention to the mirror for the first time in more than three months after he came to this world.

He also knew that the clichéd way to make money by making glass and mirrors had long been used by time travel novels he had read in his previous life, and the huge profits of glass and mirrors had long been boasted about.

But as a liberal arts student, he really can't burn glass.

If you simply add fire and burn the sand until it melts, you will not end up with glass, but something strange that is smooth but turbid in color.

He secretly took the time to do this experiment once when he was in Luoyang, and then gave up. At that time, Guan Yu almost thought that the place where he lived had a fire, but later Li Su finally made excuses.

It was not until now that he was using the daily necessities of the Mi family to entertain guests in Mi Mansion that he suddenly opened his eyes: the silver mirror in this world does not seem to be very clear, and it can still be used without glass.

It’s a pity that Li Su is also blamed for having dealt with the Zhen family many times before, but she has dealt with the butlers and shopkeepers of the Zhen family, and has never been invited by Zhen Yan and the others to stay in the Zhen family. So now it is the first time I have seen the top silver mirror of this era.

Otherwise, with the wealthy level of the Zhen family, the luxury goods that the Mi family can afford, most of them can afford.

After a while of chaos in his mind, the maid from the Mi family had already wiped Li Su's hair thoroughly, and then used a comb to combed it while slapping it with a round fan on the silk surface.

In the era without a hair dryer, it still takes a lot of effort to wash your hair thoroughly. The weather was already a little hot at the end of April, and the maid slapped her hard for 20 minutes. Li Su was cool and comfortable, and the girl was sweating profusely.

Li Su happened to figure out the big thing and asked casually: "What's your name? Do you know how much this silver mirror is worth?"

The maid was slightly shocked and quickly thought of a way to express it: "I don't have a name, and my wife and I call me Cao'er. This silver mirror is made of pure silver... It's always a few dozen coins of coins. If the young master wants to know the more detailed price, I will try to ask the manager."

After hearing this, Li Su thought to himself: He really has a humble nickname. He doesn’t deserve even a vulgar flower, so he can only be a grass.

Silver was not circulated in the Han Dynasty, but there was still some silver stock, which was mainly used for jewelry and utensils.

So in fact, the exchange rate of copper and silver is slightly higher than that of the usual money in later generations.

The silver mirror on Li Su's hand is in a square radius (the Chinese ruler is more than 22 cm, with a diameter), which is three points thick, and the back is also carved with cloud patterns and birds and beasts. It is a very atmospheric high-end product.

The volume converted into later generations is 20 cubic centimeters, which is more than 200 grams according to the density of silver. Li Su weighed and estimated the amount in his hand, and felt that it was almost the same.

The value of silver itself is about five or six jin of copper coins, but it takes dozens of jin to make a silver mirror - at least 20 jin, that is four times the material cost.

The processing fee for making gold and silver jewelry in later generations must have been less expensive.

Li Su couldn't help but be curious and continued to ask: "Is the labor cost very expensive? Are the carvings and inlays of these cloud-patterned birds and beasts extremely exquisite?"

Li Su's aesthetic ability is not strong, and he cannot tell how valuable the pattern and gold engraving process of ancient handicrafts are.

Cao'er pointed to the mirror and said, "This servant knows a little about the engraving work fee and loss on the back should not be too expensive, mainly this mirror. Even if the mirror is hidden in the most delicate silk bag, it will turn black in just one or two months and needs to be polished again.

The most expensive silver mirror is to polish the mirror. Each time you polish it, it must be at least half a minute. The mirror on your hand will be worn out for only one year. I often see a master silversmith in the mansion polishing mirrors for the ladies and ladies, so I know.

In Donghai County, I heard that only a few wealthy families and dignitaries dare to use silver mirrors like our Mi family. The other big families dare to use bronze mirrors. The bronze mirror is still clear when it looks at it, but the portrait is gray and yellow, but the bronze mirror is much slower than the silver mirror. It is not a pity to wear and tear off. A bronze mirror can last for several years."

After hearing Cao'er said this, Li Su suddenly realized that she had been deceived by the time travel novels that had been so many years!

Most of the contribution of glass to mirrors actually comes from antioxidant rather than clarity. Glass blocks the silver, isolates the air, so that the silver will not oxidize and turn black.

Whether the mirror image is clear is related to glass? The clarity is only related to the grinding process and the thickness of the wear particle size. As long as the abrasive material is fine enough, the surface of the metal material can reflect very well on the mirror surface - the stainless steel decoration columns in the lobby of the hotel in later generations can clearly reflect the figure, and the clarity is no less than that of the mirror.

Of course, unless you are like the junior high school chemistry experiment, take a glass plate and silver chloride solution, and then do a silver mirror reaction to make the silver evenly precipitate and plate it on smooth glass, it can make the precipitated silver surface as smooth as the glass surface. In this way, glass is indeed slightly helpful to clarity.

I can only say that a group of liberal arts students wrote time travel novels, and they all said it was conclusive. "Take out the glass mirror and immediately leaked the domineering sideways. The tiger's body was shocked, which made the ancients bow their heads and bow their heads." As a result, they deceived Li Su for so many years.

Now, the problem has been broken into two parts by Li Su:

First of all, to create a clearer and less loss mirror, the key is to come up with better surface grinding technology - grinding determines clarity.

Secondly, we need to create a mirror that has better durability and will not turn black after being polished. This is how glass technology is needed - glass determines durability.

In other words, the rich people among the ancients could actually use clearer mirrors, but they had to be used as consumables, and they would not dare to play with them unless they were rich and powerful families.

Li Su can never solve the problem of glass, so it is better to throw it away.

While Mi Zhu has not returned yet and is a guest at Mi family for the past two days, it is better to secretly think about how to improve the grinding technology of this era, and then create a modified silver mirror that is "as clear as a glass mirror, but not durable enough."

In this way, whether you sell it in the future or use this slightly improved version of the technology to exchange chips with Mi Zhu, you will have an extra spare tire.

In fact, it is also good to make exchange chips, because the improvement of this technology is not very large compared to old products, but it is just an improvement in quality.

In later patent terms, this kind of micro-innovation cannot be considered as the "invention" level, but can only be considered as the "utilitary new type" level.

This kind of improved thing is still expensive and expensive, and it requires big businessmen who master the channels for rich people to play with it.

If Li Su works alone, he may not be able to sell much if he gets it out.

Cao'er saw him staring at the silver mirror in a daze, rubbing it occasionally, and felt strange, and he put it on and whispered to care: "What's wrong with you, young master? Do you really want this mirror? As young master, if you really want it, the head of the family will definitely give it to you."

Li Su then came to his senses slightly: "It's not true, how could I care about a mere mirror - but by the way, do you know how this mirror is polished? Is there a silversmith in my house today to polish the mirror? I was curious for a moment and wanted to observe the silversmith's technique."

Li Su also discovered that he could not think of any countermeasures by himself.

Although the micro-improvement of the grinding process is much less difficult than making glass, it is not something that a liberal arts student in his previous life who lacks technical imagination can easily think of.

He probably never saw a ball mill in his previous life.

When Cao'er heard him suddenly say that he wanted to see the mirror polishing, he didn't know what to do: "I'll go and ask for a little while for the young master. I don't seem to hear that there is a mirror in the mansion to polish it today."

...

Li Su just wandered around like this for a few days.

As the legendary stories between "Xiaoyi Lu" and other literati have spread more and more in Qu County in the past few days, the Mi family also knew Li Su's status and became more courteous to the diet and daily life of such a "famous official", but it was because Mi Zhuzhen was not at home that he could not see him.

As for Li Su who wants to go to the city and secretly observe the Mi family's industry. As long as there is no commercial secret, the Mi family doesn't care about him and just watch it.

After a day of falling, Li Su also roughly learned that the Mi family now has a large fleet of merchant ships and trades in rivers and seas.

Qu County is equivalent to Lianyungang in later generations. The conditions of the harbor here are pretty good. At the end of the Han Dynasty, rivers entered the sea from here, and water trade was very developed. How could a rich man like the Mi family, not pay attention to water transportation trade with low freight?

However, the sea boats of this era seem to be different from inland river boats. Li Su went to Shanggang and observed them and recognized that the merchant ships of the Mi family were in the style of Huanghai sand boats in later generations. They were flat bottoms and common to rivers and seas. They were nothing more simple and smaller than the sand boats in the Tang and Song dynasties, but their appearance and layout were similar.

Of course, there is probably no watertight compartment - this is not something Li Su saw, but he read history at least and knew that watertight compartment would not appear before Tang and Song dynasties.

Therefore, the Mi family's sand boats sailed along the coastline and would not enter the distant sea where there was no land.

After strolling around the city's business names and the wharf outside the city, I returned to the guest room of Mi Mansion in the evening, and the maid Cao'er was already waiting there.

Seeing Li Su come back, the maid hurried over and sells it: "Mr. Li, what's the good news - today I told Aunt Zhao, who is in charge of us. Aunt Zhao politely reported to the lady, Miss. Miss, who is kind and kind, saying that since there are distinguished guests who want to see it, it is not a big deal to invite a silversmith from the business to come to the house to grind the mirror tomorrow. I will take the young master to see it tomorrow."

When Li Su heard this, he felt embarrassed: "This is more loss if you grind it once. Since it is not so dark that it cannot be seen, why bother grinding it in advance?"

Cao'er said proudly: "Miss said that since you are a distinguished guest in the house who has such elegant taste and want to watch it, you must not neglect it. Grinding the mirror once will only cost a few taels of silver, so why not mention it."

For a rich man like the Mi family, wearing a few taels of silver can satisfy the guests, so of course he won’t hesitate.

——

PS: I got up in the morning and looked at it. The new book period has just ended. Today is still updated as usual, and the number of words is not compressed. Next Wednesday, the most smooth situation will be available on the shelves on Friday on September 25 (see whether the subsequent competition is fierce and whether it can be scheduled to be a strong promotion period). It is not clear, so it depends on the situation.

Therefore, next week, we will continue to ask for recommendation votes, comments, and more, and collect them. If the 1 yuan live fans have not yet been realized, we will also ask for a final hand. Currently, the number of live fans is 407. If the final freeze is based on this, it will be 18,000 words on the day of the release (the app shows 22,000 fans, and this number is fake. Generally, divided by 50 times is equal to the real person. If the live fans exceed 500 before the release, the list of the web page cannot be displayed, we can judge by dividing the number of APP fans by 50 approximately. That is, before the strong push, the number of APP fans is displayed, the number of APP fans is 25,000, and the first day is 21,000, APP fans are 30,000, APP fans are 24, APP fans are 40,000, and the first pop 30,000, and so on).

Also, I would like to emphasize the importance of chasing updates. Because whether readers are following updates is an important indicator to judge whether a book is worthy of being pushed on the shelves during the sprint stage. If everyone is fattening, it may lead to the book continuing to wait for two updates a day to wait for it. If there are many people chasing updates and everyone works together, it may be put on the shelves on September 25th.

Thank you very much.
Chapter completed!