1, listen to the sound
Kaiyuan Bao Tong belongs to the coins of the early Tang Dynasty, and its production technology is very exquisite, and its materials are very particular. However, due to the long issue time, some changes will inevitably occur inside the coin today. When the copper is oxidized, the real Kaiyuan Bao Tong can still stay on the ground, and at this time, a dull and deep sound will be heard, while fake and shoddy ancient coins will make a crisp sound.
Step 2 smell it
Most of the real Kaiyuan Bao Tong are excavated from the soil, which will give off a pure earthy smell. The color embroidery of counterfeit money is artificially made, which will produce a certain chemical reaction and have a pungent smell.
Step 3 look at the density
Density is a property of matter, which can be taken as several Kaiyuan Bao Tong. The real Kaiyuan Bao Tong has the same volume under the same quality. The volume of counterfeit products is larger than that of the same substance with the same mass, while the mass is smaller than that of the same substance with the same volume.
Extended data:
Kaiyuan Bao Tong with Different Materials
1, made of copper
Bao Tong, a copper kaiyuan, is a common type of kaiyuan Bao Tong. Due to the age, there are many coins unearthed, and most of their surfaces are rusted and badly worn. The exoskeleton was thin in the early Tang Dynasty, and became wider and thicker after the middle Tang Dynasty. Kaiyuan Bao Tong generally has a thin inner shell and a square and round shape. Qian Wen directly read the word "Kaiyuan Bao Tong" in official script. The word "Yong" is very distinctive and combines the characteristics of seal script.
2. Made of gold and silver
In addition to the copper kaiyuan Bao Tong, gold and silver kaiyuan Bao Tong were also cast in the Tang Dynasty. These two precious metal coins are only for the royal reward and are not put into circulation, so the quantity is very small, especially Jin Kaiyuan, which is more precious. Jin Kaiyuan Bao Tong is made of imitation copper Kaiyuan Bao Tong, and is not used as currency to pay the court.
Baidu Encyclopedia-Kaiyuan Bao Tong