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 was covered Ruble unpleasant oxides red-brown as a result of which lay in the ground for several years. With all cleaning electrolysis oxides have been removed, but the coin has acquired an unnatural copper tide. For its removal was carried out covering the nickel coin, which was used as the anode of the other coin of the same copper-nickel alloy.

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.

This coin has been cleaned with vinegar in which she spent about a day. After removal from the vinegar it was cleaned soda and a toothbrush with clipped nap. For comparison, photographed next to the coin which was kept in good condition and has a perfect view and does not require cleaning.

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.

20 cents 1933 to have a cleaning surface dense green copper oxides on the spot which turned out not beautiful shiny pink spot copper. 15 cents in 1941 were cleaned off in vinegar and salt, after cleaning the coin was pounded into mush of soda. Time cleaning each of the coins was about 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.

15 cents in 1953 were cleaned with a solution of Trilon-B. Coin was immersed in the solution for an hour, a solution of repeatedly removed and triturated gruel of soda. To both sides of the coin uniformly cleans the coin, it is desirable to put on a loose edge and leaned against the wall with the solution container.

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.

These 20 cents in 1931 were for a few hours is cleaned in the "Dressing duckling" with the water solution. Red raid went well enough, but in two places on the coin made of copper 8 hours and 6. Since the original coin color - gray or silver, the appearance of this type of copper shades of pink does not look very nice. Also on the coin to open a large number of voids and cavities, as well as part of the relief it was lost (to clean even small details read well).

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.

To clean this coin was used paste GOI + a felt tip on the engraver (Dremel 4000, turns 10 - 15 thousand per minute.). 2 minutes from the coins were removed oxides and patina she began to shine like new. Gloss certainly beautiful, but it is not natural for the coin which for several decades.

Above all suitable cleaning method GOI paste for bimetallic coins, as with chemical cleaning problems can arise due to double-ended and then cleaning with microabrasive such problems can not be. The photo shows the result of the cleaning of bimetallic 10 rubles, for comparison, the next coin in roughly the same condition, but not shelled.