Many people like to collect, paper money, coins, no matter what kind of collection, his appearance is quite important, will affect his price in the future, in the collection of coins wear is relatively small compared to, but the time is dirty what should we do? Let's talk about how to clean coins.
What we need to pay attention to here is that it cannot be treated differently like general cleaning items!
General gold and silver coins can be treated with weak acid and weak alkali, do not strong acid, although strong acid and alkali can easily clean up the dirt, but the subsequent surface of copper-nickel-aluminum coins will be seriously corroded, which will be counterproductive!
If the coin is not so serious, you can use dish soap or soapy water, or boil it for a few minutes, which will cause less damage to the coin. ........
Old coin cleaning method........
1 There is a coin with oxidized dirt, you can use boiling water blisters, after soaking, apply some toothpaste on the surface and then wipe it with a soft cloth, toothpaste has a good ability to decontaminate. ........
2 Coins with a very serious surface are rubbed repeatedly with a coin brush to wipe off the oxide layer and restore their original appearance. ........
3 If it is only a very slight dust or fingerprint, then wipe it repeatedly with a rubber sassafras
4 Corrosion is seriously unclear pattern situation, you can first soak with dilute hydrochloric acid for a few minutes, and then soak with alkaline water, acid and alkali neutralization, reduce the damage later, rinse with water, use a brush to gently brush a few times
For ancient coins with serious surface corrosion for a long time, it is more important to be careful and meticulous, and the above methods can also be used, and the knife scraping method, heating method, dry brushing method and so on can also be used
Boiling water soaking method
The surface of the ancient coin has floating soil, how can not wash off, he is actually rust, so you can use soaking, soaked with water close to 100 degrees after brushing can be removed
Dry brushing
Rust is lighter on the dry brush can be, you can use the oil paint pen to reduce the head to leave a part of the heel, put the coin on the glass plate or flat tabletop, according to the rust situation force, and then brush well and rinse with water
Heating method
For the case of slight rust can also use this method, the principle of thermal expansion and contraction, to find a metal container with a handle, do not have to cook too long, three or five minutes, and then wrapped with a cold towel, rust will fall off, for serious rust situation can not be or it will be fragmented
Heat treatment comparison chart
Knife scraping
Some rust is very large, but the attachment is not strong, then you can use the knife scraping method to align the root of the rust, and the strength of the large rust should be mastered when eradicating
Chemical method
The above method does not work, then it can only be used in this way, take the acetic acid solution 40% concentration to put the coin into the soak, serious cases in a few tens of minutes or so to take out the brush brush, until the text is clear, rinse with water
Although the acetic acidity is relatively weak, but there is corrosiveness, we are also necessary in the operation of the hand protection, then if there is silver coin rust can also be used this method, you can take the concentration of 10% to 20% of the dilute sulfuric acid drops to the rust, rust decomposition with water and then with napkins to absorb dry water, must not use strong acid, otherwise it will affect the appearance
Metal coins will inevitably have oxidation, in the future coin protection, we are more careful, try to delay his corrosion, to ensure that the appearance can be retained longer, for future generations is also a wealth!