Ancient numismatic identification method and product standard

Boiling water cooking method: Ancient numismatic coins are often attached with red rust, real money rust adhesion is relatively strong, so any encounter with ancient coins of doubt, you can put them into the water and cook for about 30 minutes, after cooking, the rust off It is a fake product, and the rust of the authentic product is not easily detached.

The steel needle test method: The true rust of the ancient coins is not only strong in adhesion, but also relatively rigid. The steel needle tip is pressed down vertically, and after the hand is released, the steel needle will fall. If it is a counterfeit product, due to the incorporation of binders and the like in the false rust, it has a light elasticity and the steel needle is not easy to fall down.

Distinguish sound method: The longer the ancient numismatic coin is from this year's generation, the more boring the sound is. The closer the age, the crisper the sound.

Observe the copper method: The material of ancient coins is red copper, bronze, and brass. There were no brass coins before the Ming Dynasty. Most of the coins before the Ming Dynasty were made of bronze. Bronze coins are easy to break, and brass coins are not easy to break.

Comparative edition method: Chinese ancient coins are made by hand. Even if the mother money used to cast money is also carved by hand, there will be some differences between the coins. If you find a lot of treasures, their editions are exactly the same, and even the local defects are not bad at all, you should doubt the possibility of fraud.

The ancient coins were set in line with the standard, the United States and the United States. The front, back outline is complete, and the text is clear. Regardless of the crater color and patina of the raw pit and cooked pit spring product, it is natural, and it is the best product in the good product.

Second, near the United States goods. The profile is allowed to have irregularities or offsets due to shifting modes, allowing very small defects and very small cracks that do not affect the overall appearance. The grounding allows for very small leaks caused by casting; Between the casting and the use of wear caused by the slight adhesion or chaos; the main product face (usually refers to a text surface, for both sides of the ancient money with text is the main feature surface - the back of the main) basically reached the product phase nice.

Third, the top grade. The contour allows for smaller defects and cracks, but it does not damage the text, allowing for smaller leaks in the ground; the text is complete, the word mouth allows less adhesion and chaos, and the appearance of the main product is basically comparable to the United States. In principle, it is a personal collection of the lowest product.

Fourth, near top grade. Allows for small defects and cracks, cracks can be extended to the text, small leaks allowed in the ground; the text allows up to two broken pens, words (feature words - such as Huichang Kaiyuan back words) allow adhesion And the chaos only shows the outline phenomenon; the main product phase is basically reached. For the middle and low-grade ancient coins belong to temporary replacement or transitional products, for high-grade ancient coins can be left.

Fifth, the product. After the defect or breakage, the characters, characters and characteristic characters can be discriminated and leak holes can be found. The ancient coins below the average Chinese product should not be stored, but they can be used for high-grade springs and rare springs.