Memorizing method of commemorative coins
The commemorative coin is a legal currency issued by a country to commemorate international or national political, historical, cultural and other major events, outstanding figures, historical sites, rare animals and plants, sports events, etc. It includes ordinary commemorative coins and precious metal commemorative coins. . The quality is generally refined and limited.
First of all, to avoid direct bumping and rubbing with hard objects, do not put several coins in one pocket at the same time, and use softer cloth or paper to wrap them separately.
Secondly, it is necessary to prevent hand stains. The commemorative coins are shipped with a thin transparent plastic bag to protect the surface of the coin from oxidation. It is easy to take it out and touch it directly. When watching the commemorative coins, If necessary, wear thin gloves and use your thumb and forefinger to pinch the edges of the commemorative coins to prevent sweat from contaminating the surface.
Again, avoid contact with acidic materials.
Commemorative coins should be stored in a ventilated, dry place. The maintenance method of precious metal commemorative coins should be more stressful, as follows:
1. The cleaning method of gold coins, gold coins do not need to be cleaned. In case of soiling, just wash it in warm soapy water, then rinse it with water and put it in two quick and soft cloths to absorb the water.
2. The method of cleaning silver coins, the method of cleaning silver coins depends first on the oxidation degree and color of silver coins. If the silver content of high silver content is only slightly oxidized, it is best to use ammonia solution with sodium carbonate solution and toothpaste to prepare a paste to clean, or use white vinegar with a small amount of water, soak the silver coin in its solution for a few minutes, also available Gently wipe the surface of the cotton ball with the solution of the cotton ball. After the surface oxide layer is dissolved, rinse it off with water.
T-Shirt Fabric,Stretch Shirt Fabric,Fashion Shirt Fabric,Check Design Fabric
Shaoxing Cornfield Textile Trading Co,.Ltd , https://www.cornfieldtextile.com