To date, almost everyone in the house can find old coins from the times of the USSR, which they got from their parents, grandmothers, grandfathers, or simply preserved as souvenirs. True, the longer coins lie in the boxes , interacting with oxygen, the less attractive they become. How can I clean coins?
How to clean copper coins?
The simplest way to get rid of an unwanted plaque on a copper coin is simple soapy water. Leave coins in such a solution for 12-14 hours. After, remove and lightly brush with an old toothbrush. The coin will acquire a long-lasting brilliance and novelty. For cleaning copper is also suitable table vinegar 9%. Pour the vinegar into a glass and drop coins there for several hours. After you get the coins they need to be washed with running water and remove any remaining scraps with a brush. If you find on the copper coin a layer of oxide (copper), which manifests itself in the interaction with the acid, it is best to attribute such coins to a specialist. Medynka is a poisonous coating that adversely affects the person's airways, getting into the air during oxidation, so do not risk your health.
Similarly copper, you can clean and zinc coins, how to do it? You need a solution of table vinegar and baking soda. "Extinguish" the soda with vinegar (in a 4: 1 ratio, respectively) and dip the coins into the solution. Leave for a few hours. Remains of plaque and rust can be removed using wire. After the procedure, rinse the coin thoroughly, this will save the shine of the coin for a long time.
How to clean old silver coins?
As for the old coins, here you need to use running water and any detergent .
In order to clean silver coins the ammonia can be used as well as possible. Dip coins for 2-3 hours, then remove and rinse with running water. Also, for cleaning silver, acid fixers are used (they are most often used by photographers, when developing films), it will clean the coins well from the plaque. After cleaning, wipe the silver coin with a rag or brush.