How to tell the true and false copper coins?

1, knock on the door and listen. Due to the different casting years of ancient coins, the quality of impurities contained in coins is also different, so the sound made by tapping is also different. The more impurities such as tin and lead in ancient coins are lost, the duller the tapping sound will be, and the crisper the sound will be.

2. Watch the money and materials. Ancient coins made of bronze are very fragile. Ancient coins made of brass are not only hard to break, but also hard to wear, while white copper is mostly the sample coins for making ancient coins.

3. Cook in boiling water. Ancient coins encountered by collectors are often covered with black rust and red and green rust. If it is a real ancient coin, this rust is formed by long-term natural oxidation, and its adhesion is very strong. Even if it is boiled in boiling water, it is not easy to fall off.

4. Look at this handwriting. The handwriting of counterfeit money is generally blurred, while the real money is used for a long time. After a long period of wear and tear, the handwriting will become blurred. In this case, it depends on the copper penetration of the reference money. Real money is hard to identify, usually in a large area.

5、? Test the authenticity of ancient coins by friction method. Rub the rusty coin edge on the cement floor or fine sandpaper several times to see if the copper color exposed during the observation period is consistent with that of contemporary coins. If the spliced coins rub, they may expose the spliced gap, which is counterfeit money.