Teach you how to distinguish the authenticity of ancient copper coins
The main function of copper coins in geomantic omen is to ward off evil spirits, gather wealth and attract wealth. In the concept of geomantic omen, nature is a combination of tangible things and intangible concepts, and the most direct display of nature in front of people is heaven and earth. The ancients thought that the circle was the shape of the sky and the square was the state of the earth. Heaven and earth produced everything, and nature also produced human beings. The circle symbolizes equality, tolerance and harmony, while the square symbolizes order, closeness and distance. People thrive between heaven and earth, and all behaviors and ideas should follow the way of heaven and earth. Although the copper coin is small, it contains the principle of heaven and earth. How to tell the authenticity of ancient money? Hongda Zhouyi summarized ten most effective appraisal methods:
1, listen to the voice of ancient copper coins to judge the authenticity. The longer the age of ancient copper coins, the more serious calcification. Calcified copper coins lost their original sound, and the sound of metal impact was dull. The quieter the sound, the longer the time. Anyone who finds an ancient copper coin has a high voice, which means there is no calcification and can be judged as a new imitation.
2. Look at the authenticity of ancient copper coins. The materials of ancient copper coins are bronze, white copper, red copper and brass. Before Jiajing in Ming Dynasty, coins were generally made of bronze, with a small amount of white copper and more red copper coins in Liao Dynasty. Bronze is easy to fracture, and the fracture surface has no copper color, but after rubbing the fracture surface on the stone, copper color appears immediately. Copper coins and bronze carving mother money began in Jiajing of Ming Dynasty. If the copper coins or copper carving mother money before Jiajing in Ming Dynasty are found, it can be judged as post-casting.
3. Smell the smell of ancient copper coins to determine the authenticity. The longer the oxidation time of copper coins, the more serious the oxidation of copper coins. The longer the oxidation time of copper coins, the smaller the copper odor. All ancient coins with heavy copper smell can be judged as counterfeit money.
4. Tongue licking ancient copper coins to judge the authenticity. Tongue licking ancient copper coins has no taste. If it is sour, bitter and astringent, it can be judged that it is artificial rust or artificial pulp, and it will be fake.
5. The rust color of ancient copper coins determines the authenticity. After the ancient copper coins stopped circulating, they would rust if stored improperly. The rust layer of ancient copper coins handed down from generation to generation is thin, the rust is local, and the coins are mostly ancient black. Unearthed copper coins have different rust colors. Copper coins unearthed in the pit generally have a thick rust layer. After the rusty copper coins are cracked, there are "pan-gold", "pan-silver" and "pan-blue" phenomena, and the "three pan-blue" phenomena cannot be replicated. Copper coins unearthed from the bunker are generally thin in rust layer and have red and yellow rust on their faces; The rust color of copper coins in the puddle is covered by coins, which is dark green. The rust of ancient copper coins came from the inside out. Experts call it "hairy rust" and "bone rust". It is difficult to remove the real rust. Any copper coin that is easy to remove rust can be judged as a fake.
6. Pin ancient copper coins to determine authenticity. The real rust of ancient copper coins is hard, and it is hard to stick with needles. If it's artificial fake rust made of adhesive, it's soft, and it's easy to stick it in with a needle, and the needle will stand but not fall. Any copper coin standing on rust can be judged as counterfeit.
7, boiled ancient copper coins to judge the authenticity of ancient copper coins rust or green or red, or yellow or blue, strong adhesion. When encountering ancient coins with suspicious rust color, put them in boiling water for 20 minutes before looking at the rust color. If the rust color remains unchanged, it is real money, and discoloration and rust removal can be judged as false.
8. Comparing the authenticity of ancient copper coins in China, ancient copper coins were all cast by hand, and there were some differences between each ancient copper coin. If many coins are found to be identical, it can be judged that they are made by modern technology.
9. Measuring the authenticity of ancient copper coins When you measure them by hand, you will feel light, because real money is calcified and its density is small after oxidation. The density and proportion of new copper counterfeit money are high. Most of the ancient copper coins with a sense of pressure can be judged as new casting.
10, according to the size and proportion of ancient copper coins, the size and weight of ancient copper coins vary widely, so it is difficult to tell the law, but from the universality analysis, we can also understand the general law. For example, during the Warring States period, most of them were about 3.2 cm in diameter and weighed 5.4-7.4 grams. Most of the Qin "plate beams" are 2.5-2.8 cm in diameter and weigh about 3-6 grams. Most of the "five baht" of the Han nationality are about 2.4-2.6 cm in diameter and weigh 3.2-3.6 grams; Most of the "Kaiyuan Bao Tong" in the Tang Dynasty were 2.4-2.5 cm in diameter and weighed about 3.8-4.2 grams. In the Song Dynasty, most small coins were 2.4-2.5 cm in diameter and weighed about 3.4-4.2 grams. "Half-Liang" coins with a diameter of more than 4 cm are all forgeries. Small flat coins are overweight and oversized, and there are few real coins.