如果高含银量的硬币长期放置在地下，或者遭受到其他不利因素的影响，在其表面会生成很厚的一层氧化物，这时应将硬币在氨水溶液中浸泡1小时(成份：水90%和浓氨水10%)。如果没有氨水溶液，也可以调制碳酸钠溶液(将30克食用纯碱溶解于100克水中)代替。将硬币置于溶液中几个小时，直至氧化物完全溶解。
If a coin with high silver content is kept underground for a long time or is affected by other adverse factors, a thick layer of oxide will be formed on its surface. The coin should be soaked in an ammonia solution for one hour (90% water and 10% concentrated ammonia). If there is no ammonia solution, the sodium carbonate solution (30 grams of edible soda dissolved in 100 grams of water) can be prepared instead. Place the coins in the solution for several hours until the oxide is completely dissolved.
如果高含银量的银币只是受到轻微氧化，那么最好用氨水溶液加碳酸钠溶液和牙膏调制成糊状来清洗。这种糊状物用手摸起来应该柔软并且没有细小的硬颗粒。方法是用手指或者用柔软的刷子将其轻轻涂在硬币表面，待氧化物溶解后，用清水冲洗干净即可。
If silver coins with high silver content are only slightly oxidized, it is best to clean them with ammonia solution, sodium carbonate solution and toothpaste in a paste. This paste should be soft with hands and has no small hard particles. The method is to use a finger or a soft brush to gently apply it on the surface of the coin, after the oxide dissolved, rinse it off with clean water.
以铜作为中间合金的低含银量银币在严重氧化时会变成绿色。清洗这种硬币，最好用5%的稀硫酸溶液清洗。当绿锈层溶解并退去后，再采用清洗高含银量银币的方法进行清洗。但如果银币表面的氧化物很均匀，就在可不必清洗掉。
Silver with low silver content as an intermediate alloy will turn green when severely oxidized. Cleaning this coin is best cleaned with 5% diluted sulfuric acid solution. When the green rust layer is dissolved and retreated, the silver content is cleaned by cleaning silver. But if the oxide on the surface of the silver coin is very uniform, it is not necessary to wash it.
硬币一般不必清洗，特别是不能用普通橡皮或市面上出售的玻璃纤维擦拭棒擦拭，这样会划伤硬币表面。
Coins generally do not need to be cleaned, especially if they can not be wiped with plain rubber or with glass fiber swab sticks sold on the market, which will scratch the surface of the coin.
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