Chen Wenzhe is still very curious about Mu Kairong.
This professor claims to like gold, stone and jade, but his knowledge in this area is definitely not deep.
But if you think he is a paper tiger and a pseudo-expert, you are totally wrong.
At the very least, he must be an expert in porcelain appraisal.
"Xiao Chen, stop talking nonsense and bring out something good for us to see!" Professor Li also spoke.
Chen Wenzhe couldn't refuse his kindness, so he could only signal to Zheng Yu.
Zheng Yu had been anxious for a long time. Unfortunately, he didn't know how to appreciate things, so he could only listen to other people's pretentious remarks. Now, it was finally his turn.
Zheng Yu directly pulled out a necklace from his neck. Under the necklace was an oblate porcelain box, which was a flat box made of porcelain. There was a golden coin painted on the flat box.
"Da Qi Tong Bao?"
The diameter of the flat box is more than four or five centimeters, and the blue and white writing on it is definitely not small, so Professor Li, who is next to Zheng Yu, can see it most clearly.
Zheng Yu smiled and said nothing. He took the flat box and pressed it slightly. With a click, the flat box popped open, revealing a copper coin inside.
The copper coins are locked in a flat box, and there is also a buckle. It will be ejected only by pressing it.
Needless to say, the flat box was made by Chen Wenzhe, but there are many spring buckles installed inside.
Hearing Professor Li mention Daqi Tongbao, everyone perked up. This is a rare thing.
Although none of the people sitting here have ever seen Da Qi Tong Bao, they have all heard of the legend of Da Qi Tong Bao.
"Complete? Not all missing corners?"
"There are no eyes, so naturally they don't have all four eyes!"
"Look clearly, there is no word "QI" on it!"
After seeing clearly what Zheng Yu was holding, several professors immediately started talking.
After Zheng Yu put the copper coins on the table, Chen Wenzhe spoke.
"We have done an age appraisal. It has a history of more than 1,100 years, which is consistent with the time of the Five Dynasties and Ten Kingdoms and the Southern Tang Dynasty. The copper quality is no problem. Although one of the handwriting cannot be seen, but when placed under a high-power magnifying glass,
Or you can use professional repair software to restore it. It is indeed Daqi Tongbao. Taking it out this time is a test by all the seniors!"
Xiao Xiangqi was the first to say: "Then let's take a good look."
"You must take a closer look, this thing is very rare!" Mu Kairong said.
"Of course it's rare, it doesn't exist in China!" Fan Jiaxuan said.
"Good boy, do you still hide such a good thing?" Li Mingsheng said.
"This ancient coin is not damaged, how can we date it?" Zhang Jiayu asked very curiously.
"Just by putting it in a machine for a few hours, people will know that it is something from more than 1,100 years ago, and it can also analyze the composition of the copper coins." Zheng Yu said.
"This is not important. Thermoluminescence is not reassuring. There are too many ways to cheat now." Li Mingsheng said.
"Yes, copper, handwriting, etc., are not difficult to make with today's CNC machines. Basically, you can make whatever you want." Professor Mu Kairong said.
"Where did this thing come from? It's not like my students who bought it at a high price, right?" Xiao Xiangqi asked.
If it was picked up at a low price, it may be genuine. If it was received at a high price, it is very doubtful.
"Someone disguised this thing as Taiping Tongbao and came to my store and wanted to sell it to me at a high price. Look, this is the photo from that time!"
Zheng Yu immediately handed over his mobile phone. He was already prepared.
As soon as Chen Wenzhe finished speaking, he put the enlarged original picture on the table for the professors to check.
"Is it like this at that time?" Professor Li Mingsheng was very surprised.
He really didn't expect this kind of origin.
This thing can actually be modified and delivered to Chen Wenzhe's door?
Several professors looked through the photos on their mobile phones and finally saw the straight characters after the repair software had repaired them. They really couldn't see any problems.
However, when faced with a treasured ancient spring like Daqi Tongbao, which is almost an orphan, no matter how serious it is, it cannot be taken too seriously.
The appraisal 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 some theoretical basis that can be followed and used for reference, so as to complete an identification.
First of all, let’s look at the quality of copper. Most of my country’s ancient coins were cast in the form of copper alloys. 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 different ancient smelting techniques, the ancient coins minted in various 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, several major ethnic minority provinces and other places in western China minted coins using copper and a little zinc and lead. After casting, the money body turned red.
From the Han Dynasty to the Tang and Song Dynasties, most of the coins were made of bronze, which was characterized by a bluish-white copper color with a hint of reddish.
After the Jiajing period of the Ming Dynasty, the transition to brass began. During the Tianqi period, copper coins became custom-made, and the color of the coins changed significantly compared with before.
For example, the coins of the Pre-Qin Dynasty were mainly made of copper-tin alloy. The copper was bluish-red and had a hard texture.
The five-baht coins of the Sui Dynasty were called white coins because they contained a large amount of tin and the copper was white.
After the fifth year of Qianlong's reign, coins were minted and tinned, and they were called green coins.
It can be seen that there are rules to follow in the casting of ancient coins in my 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 from the Five Dynasties and Ten Kingdoms, but very few have survived.
The currencies of the Five Dynasties and Ten Kingdoms period can be summed up as having two major characteristics.
One is the prevalence of large-denomination coins, and the other is that most of the coins of this period were made of "iron", the most common metal.
Therefore, the circulation of iron money was relatively large, and the quality of coins minted during this period was not very high.
A precious treasure of Heavenly Virtue from the Five Dynasties, it is bronze in color with a hint of bluish white.
Tiance Talisman treasures handed down from generation to generation often have a black oxide layer on the surface, and the copper inside is mostly water red.
The copper color of Yongan One Hundred and Yongan Thousand is slightly yellow, and the copper color of Southern Tang coins is also yellowish.
According to historical records, Daqi Tongbao's money has slender, clear, neat and powerful inscriptions; wide edge; flat back; light yellow color; about 22.5 mm in diameter.
Obviously, the one Chen Wenzhe received was impeccable in terms of copper quality, copper color, and regulations.
There is nothing wrong with the exterior or interior, but it depends on the degree of historical aging, that is, the rust color.
There are no more than two types of coins seen today: one is excavated and the other is handed down from ancient times.
The excavated objects have been buried underground for many years, and their surfaces are covered with patina.
The handed-down products also have a layer of patina on the surface due to oxidation in the air, which is black or copper-colored.