My system is not decent

Chapter 285
Copper is a relatively stable metal and is not easy to rust at room temperature.

It will take decades or even hundreds of years to produce copper oxide and basic copper carbonate.

Due to the different particle sizes formed, copper oxide presents different colors such as yellow, orange red, bright red, dark brown, etc., commonly known as "jujube red", "chestnut shell" and so on.

The unearthed excavated coins, the surface rust color is deeply embedded in the coins, because its molecular structure is stable and compact, so the real rust is not easy to wipe off.

This is not the case for counterfeit rust, which is mostly on the surface of coins, called "floating rust" or "powder rust", which is relatively frivolous and easy to fall off.

Chen Wenzhe is very familiar with this point.

There are two ways to fake rust on excavated items. The first is to put fake coins in acetic acid and bury them in the ground to quickly produce rust color;
The second is to put the counterfeit product in a mixture of salt bittern (ammonia chloride), tin green (copper sulfate), and vinegar, corrode the new copper into the old color, and then use glue to stick the rust on the coin.

The method of fake rusting of handed down products is to blacken the fake products with fire, rub oil and wax them.

The authentic ones handed down from generation to generation are dark and smooth, while the counterfeit ones are floating and shiny.

The one in Chen Wenzhe's hands is a handed down product, it is generally light yellow, but there are also black rust spots on it, and of course it is not lacking in patina.

There are differences in the formation of green rust between the north and the south. In areas with acidic geology, the degree of oxidation is correspondingly more serious.

The north is dry, there is little rain, and it is not easy to dry, so the rust color is hard.

The south is rainy and humid, and the oxide layer is loose and mostly blue and green.

For example, the coins of the Southern Song Dynasty were issued in the south, so more were unearthed in the south. Affected by the geographical environment, the coins are generally blue-green.

If light green rust is found, there is something wrong with the money.

If the buried area is hot and dry, the copper rust will be reddish purple, but this rust color will not exist on the money body alone, it must be mixed with green rust, which is called "red spot green rust".

"Red spot and green rust" Chen Wenzhe is very familiar with it, because this is also his special skill.

Of course, Chen Wenzhe had no means to use this missing character Daqi Tongbao, because it would be superfluous.

For counterfeiting, Chen Wenzhe still has a lot of experience, so he can see the artificial rust at a glance.

As for the red rust, you should pay attention to it. It should be fake money. It is formed after the counterfeiter puts the counterfeit product in the furnace and burns it red.

This kind of imitation rust is superficial, and people with a discerning eye can tell it is fake.

All these aspects of knowledge, summed up, allowed Chen Wenzhe to conclude that this is a genuine Daqi Tongbao.

Others, on the other hand, were obviously more cautious when facing ancient coins of this level.

Especially Professor Mu Kairong, he likes to read coin inscriptions, and he seems to have a bit of a special way in this regard.

A major feature of my country's metal coins is that they are written with inscriptions.

It can be said that the font of each type of coin has its own characteristics, and the inscriptions on coins of different eras have different writing styles.

Based on these characteristics, it can be tested whether it is a coin of the same period.

In addition, while paying attention to the characteristics of various Qian Wen, we can also find out the evolution process and changing laws of Qian Wen.

These laws and characteristics can be used as the basis for identifying the authenticity of ancient coins.

The characters on metal coins such as knives, cloth, and yuan coins in the pre-Qin period were written in large seal characters.

During the Qin and Han Dynasties, the style of money documents belonged to the category of Xiaozhuan, such as half two and five baht, but it had the style of Han Li, among which Mangqian was Xuanzhen.

The calligraphy styles of the Wei, Jin, Southern and Northern Dynasties were complex. Tang coins and coins were eight-fen official scripts. After the Tang Dynasty, official scripts became popular. The Five Dynasties and Ten Kingdoms were mainly Zhen, Zhuan, and Li script.

The coins of the Northern Song Dynasty have Zhuan, Li, Zhen, Xing and Cao.

From the Southern Song Dynasty Guangzong Shaoxi to the Yuan, Ming and Qing Dynasties, Qian Wen was mainly in regular script (true script), sometimes in seal script and official script.

Because our country is a multi-ethnic country, there are Mongolian, Manchu, Hui, Dangxiang (Xixia) and other minority languages ​​in coins.

To identify whether the style of a coin is correct or not, first of all, it depends on whether it conforms to the characteristics of the time;
The second step is to see if it conforms to the characteristics of this variety. For example, "Yihua" Yuanqian, although it is a pre-Qin seal, it also has the characteristics of Qi characters, which is different from the Yuanqin characters of other countries in the same period;
It is found that there are coins from the Eastern Zhou Dynasty and the Western Zhou Dynasty. If the money is written in Xiaozhuan, it is obviously a fake;

Qin Banliang is quite famous in ancient coins. Its money body is heavy, its copper quality is excellent, and its text is raised and majestic. Know that it is a counterfeit;

If you see errors in the Manchu writing in the coins of Baoyuan or Baoquan Bureau in the Qing Dynasty, you should consider that Baoquan and Baoyuan Bureau were the most formal coin minting bureaus at the national level in the Qing Dynasty. If there are no mistakes, the coins you see must be counterfeit.

Looking at this Daqi Tongbao again, it is not difficult to distinguish the authenticity from the fake through the handwriting.

Chen Wenzhe really doesn't know about this point. This is where Professor Mu Kairong is so powerful.

"The Daqi Tongbao was cast by Xu Zhigao, the state of Wu, when he was named the king of Qi during the Ten Kingdoms period. This should be no problem. Judging from the physical rubbings of the Daqi Tongbao that have been handed down, the handwriting of this piece is exactly like the old things of the Ten Kingdoms. The text production is also very similar to the Datang Tongbao coin made by Xu Zhigao!"

"From this point, it can be seen that the words of Daqi Tongbao have comparable objects, that is, the Datang Tongbao money made by Xu Zhigao, and the pictures of the four-eyed Daqi that are circulating now can also be used as a reference , From these points, no problems were found.”

After Mu Kairong finished speaking, the other professors all looked at each other in blank dismay!
Did they witness the birth of the orphan handed down from generation to generation?The missing corner Daqi is definitely missing, but the four-eyed Daqi is not in the country either.

If this one is confirmed to be genuine, then it is an orphan handed down from generation to generation!

"I'm not as professional as you in other things, but I still have a hand in authenticating ancient coins. Why don't you just listen to the sound, and you'll know if it's an ancient coin."

At this moment, Li Mingsheng said.

"Haha, I really didn't expect this. Professor Li is an expert in this field!" Mu Kairong smiled and handed the coin in his hand to Li Mingsheng.

Chen Wenzhe was also taken aback. He had heard that silver coins could be used to tell the difference by sound, but he didn't expect that copper coins could also be used!
"A few young people, I'm afraid they haven't heard of it? There is still a big difference in the sound of ancient coins and modern coins!" Professor Li Mingsheng said proudly.

There are specialties in the art industry, and everyone has their own unique skills, such as Chen Wenzhe's gold touch skill.

In fact, to be clear, listening to the sound is not difficult, but this kind of identification method requires experience accumulation.

In fact, there are still many people who like to use the method of listening to the sound to identify ancient coins.

Due to the texture of ancient coins, the older they are, the more they are oxidized, and the sound becomes duller when they are thrown on a harder ground.

(End of this chapter)