NCS removing white spots

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silverstar1

New Member
I just wanted to ask advice from some of the experts here who have had experience using NCS in cleaning silver panda coins. Do they remove the white spots that are so typical on the panda coins? specificly the 90s era coins Thanks for any help.
 
Yes and no.

The white spots are a result of a concentration of impurities in the metal which react with the air, and cause the silver to react with the air.

NCS can sometimes remove the visible products of this reaction, but it is never a guarantee they will not return.

Generally the small pinhead dots can be removed, but the larger scars will remain.
 
Thanks, is it a reaction with air or is it a reaction with chemicles used to clean the dies which i read somewhere on here ? I have really only seen this type of spots on canadian coins and pandas.
 
So does anyone have any experiance with this , Tamo42? I know I have read what ncs says but it is pretty vague I would like to hear from people that have actually had the spots removed or if the coins came back and they were still there. Please anyone.
 
silverstar1 said:
Thanks, is it a reaction with air or is it a reaction with chemicles used to clean the dies which i read somewhere on here ? I have really only seen this type of spots on canadian coins and pandas.
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Both will cause issues. The older pandas tend to have random white spots appear in mirror fields which are a result of reaction to contaminants in air. The newer, mass minted pandas are reported to have lubricant or die cleaner pressed into the surface, this is what reacts with the silver.

silverstar1 said:
I know I have read what ncs says but it is pretty vague I would like to hear from people that have actually had the spots removed or if the coins came back and they were still there.
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What they say is vague for a reason, there is no specific data or guide about what kind of spots will or wont be removed. I have sent some terribly spotted older coins in for conservation, and they have come back perfect. I have also sent in some coins with one or two minor spots which were still there after conservation.

If you have coins with visible spots, I would recommending getting them NCS'd. They will be hard to sell that way in OMP, and the certainly wont get any worse during the conservation.
 
Hey Thanks , that was what I was wondering , I had no idea they were different causes they kind of look the same but now that you mentioned it the 90s era spots do look a lillle different from the newer ones. I will try the ncs route and maybe I will post the results I get, I just did not want to spend all the money and time if people with experience with this seem to say they cant be removed at all . .And if they cant be removed I will learn something either way
 
Consider your cost for the coin and the cost for the services. The last thing you want to do is spend $26+ conserving a coin that may or may not come back spot free if you're not going to be able to cover your expenses in a sale later on.

Like Zinger said, some spots come off, others don't, and some coins even grade MS69 with spots depending on what the cause of them is. Spots are tricky because everyone thinks a spot is just a spot, but they are caused by different things and the severity plays different roles on grades.
 
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