Cleaning silver coins
Cleaning silver coins citric acid
Since silver is very slowly dissolved in citric acid, and oxides and other coating on the coin dissolve much faster then immersion in acid, hardly affect the body of the coin, and the oxides are dissolved.
cleaning technology is that the coin was immersed in a grenade and left for a few minutes. After 10 minutes it is necessary to get a coin and a toothbrush to remove the softened dirt and oxides.
The solution is prepared from dry citric acid (most that eat ordinary, from the grocery store). The concentration of acid for about two tea spoon in a glass of warm water (to clean a coin to cook all reasonable 10 - 20 grams of solution).
The photo shows two coins were originally both grimy and album are putting no cleaning was not pleasant. As a result, cleaning with citric acid 25 Penny did not get any visible damage and began to look much better. In this case, 25 pennies were initially in good condition and cleaned took only ten minutes. For coins covered with green cleaning oxides may take several hours.
Cleaning silver coins ammonia
Clean smelling salts of silver coins is significantly faster cleaning coins in citric acid. For cleaning use of ammonia solution (10% ammonia) from any pharmacy. Conveniently it is poured into a small container (5-10 ml.), The main thing that the coin was completely immersed in the solution. Coin flip is in a solution that both sides were cleaned at regular intervals.
These 50 pennies were cleaned off for 1-2 minutes in a solution of ammonia. The disadvantage of this cleaning can be except that peculiar smell of ammonia.
Cleaning silver coins Trilon B
Trilon B means a strong and specially designed for cleaning metal surfaces. An aqueous solution of Trilon B dissolves almost all metal salts, but as Trilon not acid or alkaline it did not damage the metal. The peculiarity of cleaning silver coins in Trilon is that coins are obtained with a patina (they do not shine after the citric acid and ammonia). This effect can sometimes be useful.
Cleaning silver coins hydrochloric acid (HCL)
Hydrochloric acid is not bad enough cleans oxides from the surface of the silver coins, but there she and side effects - the coin's surface is covered by a very dense black patina (patina). Therefore, this method can be used not only for cleaning, but also for patination coins. So how to buy hydrochloric acid in pure form in stores rather than just the cleaning of coins, you can use a detergent based on hydrochloric acid - "Dressing Duckling" and diluted in water 1:10. The resulting dark layer on the coin is strong enough and can be erased only abrasive tools (eraser, GOI paste, etc.) is simply rubbed on the felt does not lead to any result.