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NCS and rusty coins


alexbq2
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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?

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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.

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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.

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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.

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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.

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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 :shock:.

Sigi

 

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