My system is not decent

Chen Wenzhe was still very curious about Mu Kairong.

The professor claimed to like gold, stone and jade, but he certainly didn't have a deep understanding of this aspect.

But if you think he is a paper tiger, a pseudo-expert, then you are very wrong.

At the very least, he must be a master in porcelain appraisal.

"Xiao Chen, stop talking nonsense, show us something good!" Professor Li also said.

Chen Wenzhe couldn't get over his kindness, so he could only signal to Zheng Yu.

Zheng Yu has been anxious for a long time, but unfortunately, he doesn't know how to appreciate, so he can only listen to other people pretending to be fake, but now, it's finally his turn.

Zheng Yu directly pulled out a necklace from his neck. Under the necklace was a flat round porcelain. This was a flat box made of porcelain with a golden coin painted on it.

"Big Qi Tongbao?"

The diameter of the flat box is more than four or five centimeters, and the handwriting outlined in blue and white on it must be quite large, so Professor Li, who is beside Zheng Yu, can see it most clearly.

Zheng Yu smiled and said nothing. He held the flat box, pressed it a little, clicked it, and the flat box popped open, revealing a copper coin inside.

The copper coins are buckled in the flat box, and there is also a buckle, and it will be ejected only when it is pressed.

Needless to say, the flat box was fired by Chen Wenzhe, but there are many spring buckles installed inside.

Hearing Professor Li mention Daqi Tongbao, everyone cheered up a bit. This is a rare item.

Although none of those sitting here have seen Da Qi Tong Bao, they have all heard the legend of Da Qi Tong Bao.

"Complete? Isn't it a missing corner Daqi?"

"There are no eyes either, so naturally they don't have all four eyes!"

"Look clearly, there are no neat words on it!"

Seeing clearly what Zheng Yu was holding, several professors started discussing immediately.

After Zheng Yu put the copper coins on the table, Chen Wenzhe opened his mouth.

"We have done age identification. It has a history of more than 100 years, which is in line with the time point of the Five Dynasties, Ten Kingdoms and Southern Tang Dynasty. The copper quality is no problem. Although there is one handwriting that cannot be seen, it can be placed under a high-power magnifying glass or with a magnifying glass. Professional repair software can also restore it, it is indeed Daqi Tongbao, this time it is taken out, it can be regarded as a test for the seniors!"

Xiao Xiangqi was the first to say: "Then let's take a good look."

"You must take a good look, this thing is rare!" Mu Kairong said.

"Of course it's rare, it doesn't exist in China!" Fan Jiaxuan said.

"Good boy, are you still hiding such a good thing?" Li Mingsheng said.

"This ancient coin is not damaged, how can we date it?" Zhang Jiayu asked curiously.

"Just put it in a machine for a few hours, and people will know that it is more than 100 years ago, and it can also analyze the composition of copper coins." Zheng Yu said.

"It's not important. Thermoluminescence is no longer reassuring. There are too many ways to cheat now." Li Mingsheng said.

"Yes, copper, handwriting, etc., with the current CNC machine, it is not difficult to make. Basically, you can make whatever you want." Professor Mu Kairong said.

"How did this thing come from? Couldn't it be bought at a high price like my students?" Xiao Xiangqi asked.

If it is picked up at a low price, it may be genuine. If it is received at a high price, it will be very suspicious.

"Someone disguised this thing as Taiping Tongbao, came to my store, and wanted to sell it to me at a high price, look, this is the photo at that time!"

Zheng Yu immediately sent the mobile phone, he was already prepared.

As soon as Chen Wenzhe finished speaking, he put the enlarged original picture on the table for all the professors to check.

"It was like this at the time?" Professor Li Mingsheng was very surprised.

He really didn't expect such a way.

How could this thing be transformed and delivered to Chen Wenzhe's door?

Several professors flipped through the photos on their mobile phones, and finally saw the word Qi after the repair software repaired it, and they really couldn't see any problems.

However, no matter how serious he was, he couldn't be too serious in the face of such an orphaned treasured ancient spring like Da Qi Tong Bao.

The identification of ancient coins is a meticulous subject, which requires the accumulation of daily knowledge, attention to observation and thinking, and careful comparison.

It is also necessary to combine the historical literature and the results of previous research to find out some theoretical basis that can be followed and used for reference, so as to complete an appraisal.

First of all, look at the quality of copper. Most of the ancient coins in our country are cast in the form of copper alloy. Therefore, the composition of the alloy is different, and the coins also show different colors.

The copper quality of coins in different eras is different, and due to the different smelting techniques in ancient times, the ancient coins minted in different regions are also different, and each dynasty has its own characteristics.

Generally speaking, coins made of copper-zinc alloy are yellow, and coins made of copper-tin alloy are cyan.

During the Qing Dynasty and the Republic of China, coins were cast in several large ethnic minority provinces in western China, and copper was added with a little zinc and lead. After casting, the coins were red.

From the Han Dynasty to the Tang and Song Dynasties, most of the coins were cast in bronze, which is characterized by a bronze color with a slight hint of red in the blue and white.

After Jiajing in Ming Dynasty, the transition to brass began. During the reign of Emperor Tianqi, the use of brass coins became a custom, and the color of coins changed greatly compared with before.

For example, the coins in the pre-Qin period were mainly made of copper-tin alloy. The copper was blue-red and the texture was relatively stiff.

The five baht coins of the Sui Dynasty were called white coins because of the high content of tin and the whitening of copper.

After the fifth year of Qianlong, money was cast and tin was called green money.

It can be seen that there are rules to follow in the casting of ancient coins in our country.

During the relatively special historical period of the Five Dynasties and Ten Kingdoms, almost every once-independent regime issued its own currency.

Therefore, there are many types of coins in the Five Dynasties and Ten Kingdoms, but very few survived.

The currencies of the Five Dynasties and Ten Kingdoms period can be summed up in two major characteristics.

One is the prevalence of large coins, and the other is that most of the coins in this period were made of the most common metal, "iron".

Therefore, the circulation of iron coins is relatively large, and the quality of coins minted during this period is not very high.

The Tiande Chongbao of the Five Dynasties, the copper color is slightly bluish white.

Tiance talisman handed down from generation to generation often has a black oxide layer on the surface, and the inner copper is mostly water red.

The copper color of Yong'an [-] and Yong'an [-] coins is yellowish, and most of the coins of the Southern Tang Dynasty are also yellowish in copper color.

According to historical records, Daqi Tongbao Qian Wen is slender and clear, neat and powerful; wide edge; flat back; light yellow in color; diameter about 22.5 mm.

Obviously, the one Chen Wenzhe received was impeccable in terms of copper quality, copper color, regulation, etc.

There is no problem with the appearance and interior, it depends on the aging degree of history, that is, the rust color.

There are no more than two kinds of coins seen today: one is excavated and the other is handed down.

The finds had been buried underground for many years, and their surfaces were covered with a patina.

The handed down products also have a layer of paste on the surface due to oxidation in the air, which is black or copper in color.