Gu Yuping didn't think it was common. In his previous teaching process, such students encountered not only one or two, but countless, and a little bit of difficulty was nothing. Gu Yuping nodded with a smile: "
Are you going to test me?"
"The exam is not enough, I just want to see it."
Gu Yu spread his hands evenly: "Okay, but I didn't bring coins with me."
"It doesn't matter, I have it here." The student immediately took out his hand from his pocket, and there was an ancient coin in his palm. Could it be that he was prepared?
The student sent the coins on his hand to the stage. Gu Yuping smiled and showed them to everyone. Luo Tian said in his heart: "It turned out to be Sankongbu!"
Gu Yuping was completely calm, and the name of the hand of God was not obtained casually: "I will explain to my classmates that this ancient coin is called Sankongbu, which was a coin from Zhao during the Warring States Period, because of its first one
Each of the two feet has a circular perforation, so it is called Sankong cloth. Sankong cloth is the most precious variety in the pre-Qin currency and is one of the most recognized treasures in the current currency world. Of course, whether it is precious or not, it depends on it.
Is it genuine?”
The student was stunned for a moment, and suddenly said with a smile: "Teacher, are you saying that this three-hole cloth is not real?" As he spoke, his legs trembled.
"Don't be nervous, I'm just taking advantage of the topic and telling other students how to identify ancient coins. First of all, we need to look at the quality of copper. Most of the ancient coins of my country's dynasties were minted in the form of copper alloys, so the alloy composition was different, and the coins also appeared accordingly. Different colors are produced. The copper quality of coins in each era is different. Due to the different ancient smelting techniques, the ancient coins cast in each region are also different, and each dynasty has its own characteristics. In general, they are cast with copper-zinc alloy The coins are yellow, and the coins cast in copper-tin alloy are blue. During the Qing Dynasty, the Republic of China, Xinjiang, Tibet and other places, they used copper and a little zinc lead to make the coins red. The Han Dynasty to the Tang and Song Dynasties Most coins are cast in bronze, characterized by copper color, blue-white, light red. After the Jiajing period of the Ming Dynasty, the transition to brass began. By the Tianqi period, the market was customized with brass, and the color of the coins occurred more than before. Big changes.”
"So, let's take a look, what copper is this three-hole cloth made of?" Gu Yuping put the coin on the palm of his hand and walked down so that the students could see clearly, and then heard him think
The answer you want: "Copper plus a little zinc lead!"
"Yes, this copper coin is red. Okay, after looking at the copper color, we will look at the rust color again. There are only two types of coins we see today: one is excavated items and the other is inherited.
It has been buried underground for many years, and its surface is covered with copper rust. The pasted products also have a layer of patina on the surface due to oxidation in the air. They are black or copper-colored."
"Copper is a relatively stable metal that is not easy to rust at room temperature. It takes decades or even hundreds of years to produce copper oxide, alkaline copper carbonate, etc. Copper oxide appears due to the different sizes of the particles formed by the particles.
Different colors such as yellow, orange, bright red, dark brown, etc. are commonly known as jujube skin red, chestnut shells, etc. The surface of the unearthed excavated coins is deeply stained into the coins. Because their molecular structure is stable and tight, it is really rusted.
Not easy to wipe off.”
"Let me give an example. For example, the Southern Song coins were issued in the south and were released in the south. Due to the influence of the geographical environment, the coins are generally blue-green. If light green rust is found, there is a problem with the money. If the area where the soil is buried is hot,
The copper rust will be red and purple, but this rust color will not exist alone on the money body, and it will be mixed with green rust, which is called "red spotted green rust". If the money body is found to be red rust, it should be fake money.
, It is a counterfeiter who puts the fake product into the furnace to burn red. This kind of rust is superficial, and a discerning person can tell it is fake at a glance." Gu Yuping raised his hand: "Some students came to see that the rust was real rust.
Is it still fake rust?"
A classmate volunteered to come up, after some trouble, nodded and said, "This is really rust, teacher, right?"
Gu Yuping said: "That's right, thank you, this classmate. We have done the second step of appraisal, and then carried out the third step of appraisal. Looking at the inscriptions of the casting city, a major feature of my country's metal casting city is that it has inscriptions written. ,It can be said that the fonts of each coin text have their own characteristics, and the coin inscriptions of different eras have different writing styles. Based on these characteristics, it can be tested whether they are coins of the same era. In addition, while paying attention to the characteristics of various coin texts, , you can also find out the evolution process and changes of money texts. 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, cloths, and round coins in the pre-Qin period were written in large seal script. During the Qin and Han dynasties, the style of the coins belonged to the category of small seal script, such as half liang and five zhu, but it already had the Han Li style, among which the coin coins were in the category of small seal script, such as half liang and five zhu, but it already had the style of Han Li, among which the coin coins were
It is a hanging needle seal script. The style of calligraphy in the Wei, Jin, Southern and Northern Dynasties is complex. The coins of the Tang Dynasty are eight-point official script. After the Tang Dynasty, official script is popular. The five dynasties and ten countries mainly include three types: Zhen, seal and official script. The coins of the Northern Song Dynasty include seal, official script, Zhen, and Xing.
, cursive. From the Southern Song Dynasty, after Shaoxi, to the Yuan, Ming and Qing dynasties, the coins were mainly regular script (real script), occasionally seal script and clerical script. Because our country is a multi-ethnic country, the coins were also Meng,
Minority writings such as Man, Hui, Dangxiang (Xixia) are like this.”
Luo Tian nodded repeatedly when he heard this. Gu Yuping is worthy of being an expert in ancient coins. He has specialized in his skills. His attainments in ancient coins are definitely ranked among the top three. A long time later, Gu Yuping asked Luo.
There is a question about heaven. If the two compete on ancient coins, who would win? Luo Tian just shook his head and said nothing. Gu Yuping sighed and said six words: "I have given birth to Yu, so why have you given birth to Liang."
"Okay, who can tell me what the font on this three-hole cloth is?" As soon as Gu Yuping finished speaking, the student who originally wanted to make things difficult for him immediately said: "It's a big seal script!"
"Yes, this step has taken another step to verifying the authenticity of the Sankong Bu. Now we have to listen to the sound." Gu Yuping let go, and the Sankong Bu fell on the cement floor: "Student, what sound did you hear? It's a mute voice.
, or a crisp and loud sound?”
"Silent voice!" the students replied in unison, this was too easy to distinguish.
"Due to the texture of ancient coins, the older they are, the more fire is, the more severe the oxidation is, and the more mute the sound it throws on the cement floor. Generally speaking, the knife, cloth, and round coins in the pre-Qin period were all mute.
Coins after the Ming Dynasty were close to the present day and had not yet been oxidized deep, and the sound was crisp and loud. If we threw coins from the pre-Qin period on the ground and heard a crisp sound, this money would be unreliable; on the contrary,
If the Ming and Qing coins were to be mute, they would also be suspicious.”