Cleaning the copper-nickel coin
Copper-nickel coins fairly well preserved in an aggressive environment and in the soil. And as a copper-nickel alloy began to mint token coin in Russia only in 1931 that ocbo old and heavily oxidised coins do not exist. But most importantly, what happens to the nickel coin is covering oxides unpleasant red-brown color. These oxides are quite difficult to clean.
Nickel coins Cleaning soap
Soap solution for copper-nickel coins perfectly removes green oxides (as well as at cleaning copper coins), But the red oxides almost touching.
Shoe electrolysis nickel coins
For copper-nickel coins in their cleaning electrolysis, there is one special restriction: if the anode ( "+") to use graphite or stainless steel surface of the coin will be well cleaned of oxides, but due to the presence in the composition of the copper coins acquire the characteristic copper tide. To overcome this limitation, you can either use an anode of a nickel or to clean in two stages: first - cleaning with conventional anode and the second - a covering layer of nickel coins (same shoe but with a nickel anode).
This cleaning method is not universal and unique. On the contrary, showing good results for coins with weak damage field coins for heavily oxidized coin electrolysis opens all the cavities and other defects.
|These 20 cents in 1945 were heavily covered with oxides of copper and nickel. As a result, cleaning electrolysis all oxides have been removed, but opened deep cavities. In addition, the coin color was dark.|
Cleaning copper-nickel coins in acetic acid
Vinegar is an aggressive environment may be used for dissolving oxides on the surface of the coin. The disadvantage of this method of cleaning is to damage the surface of the coin, the photos can be seen that all the coin after the vinegar becomes dotted with small cavities. Besides coins color changes with unnatural reddish-brown at least unnatural pink.
Cleaning copper-nickel coins in vinegar with salt
That is to say, an attempt to improve the cleaning of the previous method, the main disadvantage of cleaning with vinegar is the appearance on the coin of the weak, but still noticeable pink copper plaque. Particular attention should be paid to the green on the coin, in the areas of copper-nickel coins which are dense green copper oxides after such cleaning copper remain pink spots, which is not very nice. Thus, this method is applicable in cases when the coin is covered with red uniform nickel oxides.
The essence of technology lies in the fact that 50 grams of 7% vinegar add a teaspoon of ordinary table salt and a little stir. This amount of salt hard to dissolve in such a small amount of vinegar, but it is not required, the salt must be dissolved and remains lying on the bottom of the tank in which the cleaning is carried out. Coins with a cleaning is not necessary to put on the edge and just lay on the salt and every 2-5 minutes, flip. Depending on the degree of oxidation required coin from 5 to 20 minutes.
Shoe nickel coins Trilon-B
Trilon-B fairly strong cleaning agent, it easily dissolves any oxides on the coin. And as in the copper-nickel coins do not have such a valuable patina as copper or silver, the cleaning Trilon for them can not hurt.
Cleaning the Soviet copper-nickel coins in hydrochloric acid (HCl)
As in conventional stores to buy pure hydrochloric acid is problematic, the cleaner plumbing "Dressing duckling" has been used for cleaning which includes the very hydrochloric acid.
Nickel coins Cleaning paste GOI
In general abrasive cleaning method is not desirable and not entirely suitable for the rare and valuable coins, but can be used to make low-gloss coins from the modern or very old hodyachki. On the value of the coins such cleaning effect is only negative, so if the coins ever to be sold then it is better not to brush paste GOI and other mikroabrazivami. As a result of such cleaning overwritten small details and this method is not suitable for medium or weak coins stored as the terrain may be completely destroyed.