The real Liang Wudi coins (Shunzhi Bao Tong, Kangxi Bao Tong, Yongzheng Bao Tong, Qianlong Bao Tong and Jiaqing Bao Tong) are only small flat coins, that is, the face value of a penny is between 24 and 28 mm in diameter. Of course, there are some exceptions, but that is not the majority, and the diameter difference will not be too much.
2. Look at the thickness.
The five emperors' coins are all small flat coins with a diameter of about1-3 mm. Even if it is dry, the thickness will not exceed 4 mm. If you come across a string of five-emperor coins with a particularly thick thickness of 5- 10 mm, and the thickness of each coin is very consistent, then this string of coins must be fake.
3. Listen to the sound. The voice of ancient money is pure and upright, and there will be no inflection point; Fake money will make a crisp sound.
4, look at the patina.
The so-called patina is the oxide film formed by the circulation of copper coins for hundreds of years. Because every copper coin in the authentic five emperors coins has been circulating for two or three hundred years, it will have different degrees of patina.
Step 5 weigh. The old money is old, and the gas has been removed. It feels a little lighter than the new currency.
Extended data:
"Most of the ancient coins were unearthed. There must be different rust marks on coins. Of course, rust will have different colors. Common ones are green rust erythema, blue rust or dark brown copper.
But no matter what rust, modern people can make it. Some rust is easy to identify. Real rust is natural rust formed over hundreds or even thousands of years, such as hard green in patina, which is very hard. Generally, the hardness of fake green rust can not reach the hard green effect of genuine products.
There is also some rust, which has been integrated into the coin itself due to long-term erosion, and we call it soil green. This kind of rust is generally not easy to fall off, while the rust of counterfeit money is easy to fall off. But now the technology is more and more developed, and ordinary rust is easier to identify. If it is painted with real rust, most people won't recognize it. Collectors pay special attention when choosing ancient coins. "
References:
Baidu encyclopedia-five emperors' money