alexbq2 Posted February 11, 2014 Report Share Posted February 11, 2014 I've got a 1830 10 kopecks Novodel, that has ugly crusty black spots. I've had it soaking in olive oil, for many months now, with no change in color either in coin or oil. Not sure what to do with it, but when I looked online, I did come across this statement on the NGC website: "NCS can remove contaminants such as PVC, soils, tarnish, carbon spots, verdigris and encrustation from the surface." If they can help I will gladly send it over. Question is can they really help? Has anyone tried NCS services for copper coins with spots or encrustation? Quote Link to comment Share on other sites More sharing options...
kopeikin Posted February 11, 2014 Report Share Posted February 11, 2014 A picture is worth thousands words. Could you show a picture of coin problems? Quote Link to comment Share on other sites More sharing options...
BKB Posted February 12, 2014 Report Share Posted February 12, 2014 would love to see that. I do not have 10 kop yet... Quote Link to comment Share on other sites More sharing options...
alexbq2 Posted February 12, 2014 Author Report Share Posted February 12, 2014 Quote Link to comment Share on other sites More sharing options...
BKB Posted February 12, 2014 Report Share Posted February 12, 2014 did you try .5% vinegar solution? It should take care of the incrustation... I use it with relative success. Quote Link to comment Share on other sites More sharing options...
alexbq2 Posted February 12, 2014 Author Report Share Posted February 12, 2014 What do you do with it? Soak the coin? For how long? Quote Link to comment Share on other sites More sharing options...
BKB Posted February 12, 2014 Report Share Posted February 12, 2014 a coin like that, I would just sit there and watch. Soak it for 5-10 min, then try to remove crust with a wooden toothpick. Do not touch the field because you may leave scratches. Just the crust. Watch the color of the coin. Should not affect it, but, you never know. Sometimes the crust just dissolves. Then you will need to dry it with alcohol after you done. Quote Link to comment Share on other sites More sharing options...
gxseries Posted February 12, 2014 Report Share Posted February 12, 2014 I would have to politely disagree with the vinegar solution - it strips the patina very quickly. Best to leave it to the experts especially if you are dealing with expensive coins. Quote Link to comment Share on other sites More sharing options...
squirrel Posted February 12, 2014 Report Share Posted February 12, 2014 That is a beautiful coin! LEAVE IT ALONE!! you wont ever get the dark spots to match the field's patina. Microscopically, the texture of the corrosion is not as smooth, because the copper has been eaten away and oxidized with a different composition as the undamaged patina surface. I t would have to be polished smooth, and no chemical can do that. Quote Link to comment Share on other sites More sharing options...
BKB Posted February 12, 2014 Report Share Posted February 12, 2014 There are no experts this side of the ocean that I know, that can fix this. I do not know if this corrosion type is active like the green crap, but, if it is -- you leave it alone and it will eat holes big enough to hide in it. I would go on a russian forum and ask a specialist about it. I would not just leave it, until I knew for certain the problem will not progress. Quote Link to comment Share on other sites More sharing options...
alexbq2 Posted February 13, 2014 Author Report Share Posted February 13, 2014 The Great Alchemist on the russian forum told me not to touch it. So is NCS worth a try? Quote Link to comment Share on other sites More sharing options...
kopeikin Posted February 13, 2014 Report Share Posted February 13, 2014 If you really up to messing with this coin may be you can contact NSC customer service with your coin photographs and ask if they can improve appearance of this coin. As to me I believe nothing can or should be done to corrosion on this coin. In fact I like this coin the way it is. Quote Link to comment Share on other sites More sharing options...
sigistenz Posted February 14, 2014 Report Share Posted February 14, 2014 Even if you obtain the same beautiful chocolate color all over, the raw areas will remain raw. As they reflect light differently, the raw areas will always stick out as a different shade . Sigi - Quote Link to comment Share on other sites More sharing options...
BKB Posted February 14, 2014 Report Share Posted February 14, 2014 If a guru told you not to touch it, he most likely believes the corrosion will not progress. Then, it is only an issue of esthetics... Quote Link to comment Share on other sites More sharing options...
DAJ Posted February 15, 2014 Report Share Posted February 15, 2014 My NCS experience was with silver. But they did a good job with that. A fine coin. Quote Link to comment Share on other sites More sharing options...
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