1, rust color
True: Coins are usually blue-green. 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. 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.
Fake: Counterfeit money is light green rust color. Fake rust is mostly on the surface of coins, which is called "floating rust" or "powder rust". Flighty, easy to fall off. Often boiled in alkali water, the fake rust on it is vulnerable.
2. Listen to the sound
Correct: It sounds silly to throw it 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.
Fake: If we throw coins from the pre-Qin period on the ground and there is a crisp sound, then the money is fake; On the other hand, if the Ming and Qing coins are dumb, they are also fake.
Step 3 smell it
True: There is no peculiar smell.
Mistake: Most decorations are forged with chemicals, which often give off unpleasant pungent chemical smells.
Extended data:
Introduction of Chongning Bao Tong:
1. Qian Wen's calligraphy is exquisite and handsome, with iron hooks and silver hooks, which is the true embodiment of Huizong Zhao Ji's thin gold calligraphy. It is one of the two most valuable bronze coins at present.
2, the money is heavy, bronze, rusty, old, open the door. It is called Da Yin because Qian Wen is full of four Chinese characters, which are connected with the outline. The word "Bao, Ning" has a long crown and leans to the left. It is similar to the recognized Chinese character "Chong Tong Ning Bao" contained in each spectrum. Except that the diameter of money is slightly smaller, the outline width, perforation size and color are basically the same.
References:
Baidu Encyclopedia-Chongning Bao Tong