1. How to check the authenticity of ancient coins by washing?
Put the detected coins into clean water and take them out in a few days, and the dirt, oil stains and floating rust attached to the coins will fall off. Counterfeits on counterfeit money are also easy to find.
2. Does the probe test the authenticity of ancient coins?
For the local doubts about the northern test currency, you can tentatively poke it with sewing needles and other things. Ancient money is really rusty, with strong adhesion and high hardness. When the needle tip of sewing needle is pressed vertically downward, the steel needle will fall off after letting go. The rust of counterfeit money is slightly elastic, and the steel needle is not easy to fall off.
3. Does the friction method test the authenticity of ancient coins?
Rub the rusty coin edge on the cement floor or fine sandpaper several times to see if the copper color exposed during the observation period is consistent with that of contemporary coins. If coins are put together, there may be cracks after rubbing.
4. Does the acid test verify the authenticity of ancient coins?
For coins with serious corrosion, you can soak them in vinegar for a period of time, or use dilute hydrochloric acid for local inspection, or use both to remove rust and find out the authenticity. Acidity test is the most suitable method to identify the authenticity of silver coins. But if you hurt your money, you need to be careful.
5. Identify the authenticity of ancient coins in form?
From the modeling point of view, it has the authenticity of ancient coins, that is, it is identified one by one from the modeling mechanism, casting technology, coin composition and Qian Wen. Look at the difference between an ancient coin and its characteristics of the times. If the difference is too big, we should pay attention to whether it is a fake.
The authentic Qian Wen, patterns, outlines and perforations of ancient coins are very clear and regular, and the natural surface wear and impact scars are irregularly distributed, the counterfeit money is rough, the Qian Wen, patterns and outlines are vague, there are many trachoma and blowholes, and the surface wear and impact scars are regular or not.
6. The handwriting is blurred. Is it true or false?
The handwriting of counterfeit money is generally blurred, while the real money is used for a long time. After a long period of wear and tear, the handwriting will become blurred. In this case, it depends on the copper penetration of the reference money.
The handwriting of real money is vague, generally in a large area, and at the same time, the money will be greatly worn, that is, the degree of illegibility is synchronous with the wear and tear of the money body, while counterfeit money is generally complete in newer copper, but the handwriting is vague.
7. Distinguish the authenticity of ancient coins from the sound?
Due to the age of ancient coins, copper was oxidized, which removed the vitality of new copper. The sound of knocking is deep and dumb, pure and without tone sandhi. The price of new actors is very high. Gently, it will make a crisp sound accompanied by transliteration. Money in Ming and Qing dynasties, because of its age, will make a loud noise after being knocked or collided.
In addition, some counterfeit money, made of two thin copper sheets, will make a hoarse voice after being struck. The prices of digging, repairing and embedding are patched together, and there is a broken sound when knocking, but there is no pure metal sound.
8. Distinguish the authenticity of ancient coins by smell?
Authentic ancient coins have rusted because they have been buried underground for a long time. When unearthed, it will have a pure earthy smell and no peculiar smell. Counterfeit money has forged rust color, pungent glue smell, pine smell, raw paint smell and other strange smells.
9. Identify the authenticity of ancient coins by weight?
The original materials of ancient coins are exquisite, and the copper is exquisite. Because of the age, the internal composition has changed and the weight will be greatly reduced. But the copper used for counterfeit money is relatively thick and heavy, so you can tell its authenticity from two aspects.
10, how to cast forged ancient coins?
Use mother money or clear-cut circulating coins as models to turn sand. Most of them use real money to make molds or use cork, stones and bones to carve some ancient money models to turn sand.
Coins forged in this way are almost the same as real coins, but due to thermal expansion and cold contraction, counterfeit coins dug out of sand are smaller than real coins. Forged money by casting method is rough, and the characters and outlines are very different from real money. You can tell the difference if you look closely.
1 1. Forge ancient coins by carving?
There are two ways to change engraving: one is to choose the money with thicker premise in the same period, grind off the original text and replace it with rare treasures.
The other is to choose Qian Wen's fuzzy coins, add lettering or moon characters, and do something unconventional.
12, digging and filling method to forge ancient coins?
Digging out a certain keyword or all the ordinary ancient coins will become a rarity of using chemical materials to forge Qian Wen subsidies. Or dig out the inscriptions of two ancient coins and make one or two treasures.
13, spelling forged ancient coins?
Grinding two coins with the same size and putting them together to synthesize a misprinted coin or a folded coin with words on both sides is a common counterfeiting method for machine-made copper coins.
What are the methods and skills of ancient coin identification?
1, depending on the quality
Most coins in ancient China were cast in the form of copper alloy, so coins showed different colors due to different alloy compositions. The copper quality of coins in different times is different, and because of the different ancient smelting techniques, the ancient coins cast in different regions are also different, and each dynasty has its own characteristics. Generally speaking, coins cast by copper-zinc alloy are yellow, and coins cast by copper-tin alloy are blue. During the Qing Dynasty and the Republic of China, money was cast in Xinjiang, Tibet and other places, using copper and a small amount of zinc and lead, and the money was red after casting.
The coins in the pre-Qin period were mainly copper-tin alloy, and the copper was bluish red with hard texture. Most coins from the Han Dynasty to the Tang and Song Dynasties were made of bronze, which was characterized by a bluish, white and reddish copper color. Five baht money in Sui Dynasty was called white money because of its large tin content and white copper. After Jiajing in Ming Dynasty, it began to transition to brass. In the apocalypse, coins made of brass became customized, and the color of coins changed greatly compared with before. It can be seen that there are laws to follow in the casting of ancient Chinese coins. In the later period, coins were cast with silver, and a small amount of other metal elements were added, such as Guangxu Yuanbao Silver Dollar and Yuan Datou Silver Dollar, all of which were typical coins.
Step 2 pay attention to rust color
There are only two kinds of coins now: one is unearthed and the other is handed down from generation to generation. Excavations have been buried underground for many years, and the surface is covered with bronze rust. Due to the oxidation in the air, the surface of products handed down will also have patina. Black or copper.
Copper is a relatively stable metal, which is not easy to rust at room temperature. It takes decades or even hundreds of years to produce copper oxide and basic copper carbonate. Copper oxide has different colors such as yellow, orange-red, bright red and dark brown due to different particle sizes, commonly known as "jujube skin red" and "chestnut shell".
The rust color on the surface of excavated coins is deeply dyed into coins, because its molecular structure is stable and dense, so the real rust is not easy to erase. The color of forging rust is not. Fake rust is mostly on the surface of coins, which is called "floating rust" or "powder rust". It is frivolous and easy to fall off. Often boiled in alkali water, the fake rust on it is vulnerable. There are two ways to dig up counterfeit money: (1) put counterfeit money into acetic acid and bury it underground to quickly generate rust color; (2) Put the counterfeit money into the mixed solution of brine sand (ammonium chloride), tin green (copper sulfate) and vinegar to corrode the new copper into the old color, and then stick the rust on the coin with glue. The handed down method of fake rust is to blacken, oil and wax the fake with fire. Handed down from ancient times, the real thing is calm and smooth, while the fake thing is fleeting.
The formation of green rust is different in the north and south, and the oxidation degree in acidic areas of geological belt is also serious. When it is dry and rainy in the north, the rust color is hard. It is rainy and humid in the south, and the oxide layer is loose, mostly blue-green. For example, coins in the Southern Song Dynasty were issued in the south, and more were unearthed in the south. Due to the influence of geographical environment, coins are generally blue-green. If light green rust is found, it means there is something wrong with money. If it is buried in a hot and dry place, the copper rust will be reddish purple, but this rust color will not exist alone on the money body, but will be mixed with green rust, which is called "red spot green rust". If it is found that the money body is red rust, it should be counterfeit money. It is the counterfeiter who puts the fake goods in the stove to burn red. This kind of imitation rust is superficial, and a discerning person will know it is fake at a glance.
3. Look at the inscription on the coin
A major feature of China metal coins is that they have inscriptions on them. It can be said that the font of each coin has its own characteristics, and the writing style of coin inscriptions in different times is also different. According to these characteristics, it can be checked whether it is a contemporary coin. In addition, while paying attention to the characteristics of various inscriptions, we can also find the evolution process and changing law of inscriptions. These laws and characteristics can be used as the basis for distinguishing the authenticity of ancient money.
In the pre-Qin period, the characters on metal coins such as knives, cloth and money were all written in big seal script. Although the inscriptions in Qin and Han Dynasties belong to the category of small seal script, such as Banliang and Wuzhu, they have their own styles, among which Mangqian is a hanging needle seal script. The calligraphy style of Wei, Jin, Southern and Northern Dynasties is complicated. Coins in the Tang Dynasty were written in eight official languages, which prevailed after the Tang Dynasty. In the Five Dynasties and Ten Kingdoms, authenticity, seal and official script were the main characters. Coins in the Northern Song Dynasty include seal, official seal, truth, travel and grass. From Shao Xi, Song Guangzong to Yuan, Ming and Qing Dynasties, the inscriptions were mainly regular script (original), and occasionally seal script and official script. As China is a multi-ethnic country, the inscriptions on coins include Mongolian, Manchu, palindrome, Tangut (Xixia) and other minority languages.
To identify whether the text of a coin is correct, we must first look at whether it conforms to the characteristics of the time; The second step is to see if it meets the characteristics of this variety. For example, although "Yihua" is a pre-Qin seal script, it also has the characteristics of Qi characters, which is different from the money characters of other countries in the same period; Found money from the Eastern and Western Zhou Dynasties. If Qian Wen wrote it in Xiao Zhuan, it is obviously a fake. Qin Banliang enjoys a high reputation among ancient coins. Its money is thick, its copper is excellent, its Qian Wen uplift is majestic, and the word "human" in the word "two" in Qin Banliang is majestic. If you find Qian Wen apartment, you will know it is fake at a glance. If you see mistakes in Manchu writing on coins in Baoyuan or Baoquan Bureau in Qing Dynasty, you should consider that Baoquan and Baoyuan Bureau are the most formal mint bureaus in Qing Dynasty, and there is absolutely no mistake in Manchu writing, so the coins you see must be counterfeit.
4. Listen to the sound
Due to the texture of ancient coins, the older they get, the more angry and oxidized they are, and the dumber they sound when thrown on the concrete floor. Generally speaking, knives, cloth and money in the pre-Qin period were dumb. After the Ming Dynasty, coins were relatively new, without deep oxidation, but their sounds were crisp and loud. If we throw the coins of the pre-Qin period on the ground with a crisp sound, then the money is not very reliable; On the other hand, if the Ming and Qing coins are dumb, it will also make people suspicious.
5, understand the casting method
China ancient coins probably went through several stages of development, such as sub-mold (earth, stone, copper), mother mold (brick, copper), sand turning and so on. Various casting methods, whether real money or fake goods, will leave corresponding marks on coins. These marks are a powerful basis for us to identify the authenticity of coins today.
Step 6 smell it
This method is the simplest in the identification of ancient coins. Because counterfeit money is mostly decorated with chemicals, it often emits an unpleasant and pungent chemical smell, while real money does not have this smell.
7. Watch the version
The main way to distinguish between ancient coins and versions is to look at the money spectrum and get in touch with the real things, so as to be familiar with the real coins of various dynasties. We should pay attention not only to rare products, but also to a large number of common varieties. Because these ordinary products are rarely fakes, they can truly reflect the characteristics of coins in various historical periods. For example, in the Warring States period, the knife cloth had a special shape, so counterfeiters had to turn over sand to make fakes. The defects are that the coins after sand turning are too small and heavy, the words are superficial, the copper is rough, the rust color is wrong, and it is easy to fall off. Moreover, when casting knife coins, the gate is on the knife ring, and the gate for distributing coins is at the head end, which basically does not need pruning and keeps the natural state. However, for the sake of beauty, counterfeiters often smooth the edges of knife coins and cloth coins, which is actually gilding the lily and revealing flaws. Another example is Huichang Kaiyuan, because Yangzhou uses regular characters to record years. If anyone is found reciting the word "Yang", whether handed down from generation to generation or unearthed, it should be regarded as a fake. Because the version of Xianfeng coins in the Northern Song Dynasty and the Qing Dynasty is the most complicated, and it is also the object that counterfeiters compete to imitate, it is necessary to analyze its shape and grasp its characteristics to prevent being deceived.