The raw pit and cooked pit of ancient money
There are also fakes in the pit, which are ancient money forged by later generations. We mainly identify the authenticity of coins in the pit by observing their characters and rust color. Because most of the words on coins are written by famous artists, and the words learned by forgers have different forms, and sometimes the shapes of words and coins are different. Although the bronze rust is real, the coins are still fake.
Copper is a relatively stable metal, and it is not easy to rust under normal temperature and humidity. After hundreds or even thousands of years of burial, the surface of coins has undergone chemical changes. The copper oxide produced has different colors due to different burial conditions and sizes of coins, but this copper rust will not fall off. The rust of some counterfeit products is specially treated and decorated. Although it is very realistic, it will fall off after soaking in boiling water.
In ancient money, there are still cases where real money has fake rust and fake money has real rust. Ancient money handed down from ancient times will not rust itself, but when it comes to hydrochloric acid or acetic acid, it will grow loose green rust, which looks like a disguise. This is a special phenomenon, and collectors need to be careful not to abandon the real thing. The other is that the ancient money itself is covered with rust, which is true, but the counterfeiters carved or dug these into rare products, so we should also pay attention to this kind of counterfeit money.