How to clean coins?
In order to remove particles of earth from the coin surface, dust and traces of metal oxidation, it is necessary to clean the coins. But it is not uncommon when the value of a coin is lost due to non-professional cleaning. To prevent this, it is important to become familiar with coin cleaning methods that will help remove any contamination easily and carefully.
How to clean coins from different metals
The easiest way to remove dirt and dust from a coin is to wash the coins in warm water using a soft brush or a regular toothbrush. This method is suitable for different types of coins from different alloys and metals. It is more difficult to deal with different types of oxidation, as in this case you will have to pay attention to the composition of the metal of the coin.
- To clean the gold coins it will be enough to wash them in warm water using baby soap and a soft brush.
- To clear silver coins, you will have to pay attention to the silver sample, which is an important factor in this process. In order to clear a silver coin not lower than the 625th sample, you can use a solution of 10% ammonia, which you can buy at any pharmacy.For cleaning low-grade silver coins, ordinary lemon juice will fit into which the coin should be completely immersed so that it is not in contact with air, because such contact can lead to the formation of non-removable oxide. Do not forget to periodically turn the coins in the solution so that their parts are completely in contact with the chemical reagent. Coins should be in the solution as long as necessary to completely dissolve the oxides. When oxides are removed, the coins should be rinsed in warm running water and dried. The easiest and most affordable way to help you clean silver coins is to wipe them with baking soda. Lightly moisten the baking soda with water and wipe the silver coin before removing oxides from it.
- To learn how to peel copper coins, see the following effective ways. The most accessible, but time-consuming method of cleaning such coins is a soap solution, in which they should be immersed. The advantage of this method is its safety for the copper alloy. To clean the copper coins in this way, they should be periodically removed from the soap solution, rinsed under running water and cleaned with a soft brush.The second way is to use regular table vinegar, with 5-10% acetic acid content. If there is a slight oxidation on the coin, then it should be kept in vinegar for a few minutes; if it is extensive damage, then it is worthwhile to continue up to several hours. After this cleaning, rinse the coins under running water and dry.
- To clean coins of iron and zinc alloys, more careful methods of cleaning will be needed, for which the use of a weak solution of hydrochloric acid and a brass brush is suitable. To begin with, with the help of a thin needle, the signs of rust and whitish plaque should be removed from the surface of the coin. Then dip the coin in a very weak solution of hydrochloric acid and after melting of the oxides and rust, rinse it in running water and dry it. Also, so that the coin unusually glittered, after drying, you can apply its rubbing on an ordinary felt boot or a piece of soft felt.
When cleaning coins, do not use:
- Concentrated solutions of acetic, sulfuric, hydrochloric and nitric acids. All this can lead to the melting of the coinage on the coin.
- Different types of building skins.
- Brushes with metal bristles.
- Bronze coins cannot be omitted in any chemistry, otherwise the old patina will disappear.
- Copper and bronze coins should not be immersed in the same solution, since copper salts that dissolve in the solution can easily change to bronze and give it a red tint.
Now, having studied various methods, you will be able to clean the coins yourself as professionally as the specialists do.