How to distinguish the authenticity of copper coins in Qing Dynasty

Listen to the voice first to determine 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.

Second, smell the truth. The longer the time of ancient copper coins, the more serious the oxidation, and 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.

Third, look at the rust color to determine 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 phenomena of "pan-gold", "pan-silver" and "pan-blue"

The phenomenon of "three flooding" cannot be copied; 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.

Fourth, the tongue is true and false. Lick money with your tongue, the real thing is tasteless. If it is sour, bitter and astringent, it can be judged that it is artificial rust or artificial pulp, and it will be fake.

Five, boiled to determine the authenticity. The rust on ancient copper coins was green or red, or yellow or blue, with strong adhesion. When you encounter expensive coins with suspicious rust color, put them in boiling water for 20 minutes before seeing the rust color. If the rust color remains unchanged, it is real money, and discoloration and rust removal can be judged as false.

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Matters needing attention in the maintenance of ancient copper coins:

The maintenance of ancient coins is mainly rust removal, and there are many ways to remove rust. Experts suggest that the rust removal of ancient coins is not easy and thorough. It is best to remove the floating rust on the surface and see the ancient coins clearly. Never remove rust in strong acid and alkali, nor use sharp tools to remove rust, which will damage ancient coins.

The most ideal method is to choose a big oil painting pen, subtract some brown hairs from the tip of the nose, leaving only the roots of 5 to 7 mm. Using this homemade brush to brush the rust on ancient coins can properly brush off the floating rust and residual embroidery on ancient coins without hurting the patina on ancient coins.

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