NCS conservation article--what is the process?
logger7
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https://www.ngccoin.com/news/article/12206/
A before and after promotion article. What are they using on gold besides acetone? Is the process really that complicated? Other chemicals, higher temperature baths, a pressurizing vessel?
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The before on this coin:
I personally think looks better- more original for the piece, than the now:
peacockcoins
Their techniques and procedures to conserve coins is proprietary. In other words, they won't be giving away any trade secrets.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
That may be true, however the procedures are known by some here, that's why I asked.
I read somewhere that copper spots on gold coins can be removed using a small hand-held butane torch. Not sure if the conservation services at the major grading companies will do this though. I wonder if CACG will eventually offer a conservation service to keep up with NGC and PCGS.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
I heard also that's how they do it; also cyanide used to be used for that I think.
J. Sanford Saltus (1853-1922) was a very prominent numismatist who met his demise by accidently drinking cyanide. He was sitting at a table dipping brown large cents in cyanide to make them bright red. There was a glass of ginger ale next to the glass of cyanide and when he was concentrating on his coins, he grabbed the wrong glass to take a gulp.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
There is also the redox reactions if you remember from chemistry - this removes spots especially from gold very well...
Well, just Love coins, period.
I heard that they use laser ablation, too.
Sometimes, it’s better to be LUCKY than good. 🍀 🍺👍
My Full Walker Registry Set (1916-1947):
https://www.ngccoin.com/registry/competitive-sets/16292/
Coin doctors used to use lasers to remove hairlines from proof gold surfaces. This alteration can be detected so I doubt it's done much anymore.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
I have posted results on these boards and others (cointalk) that followed chemical principles of redox on gold.
Well, just Love coins, period.
They don’t use it for hairlines. They use it for spots and such and it is, supposedly, quite effective.
Sometimes, it’s better to be LUCKY than good. 🍀 🍺👍
My Full Walker Registry Set (1916-1947):
https://www.ngccoin.com/registry/competitive-sets/16292/
From what I've read, they run a narrow targeted laser along the hairline and melt the surface to close the scratch.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
I believe you that coin doctors do it but not NCS. NCS uses it for blemishes. At least, that’s what I’ve heard.
Sometimes, it’s better to be LUCKY than good. 🍀 🍺👍
My Full Walker Registry Set (1916-1947):
https://www.ngccoin.com/registry/competitive-sets/16292/
Or anytime soon
They will. In the original Q&A on their forum when the grading stuff was announced I asked about this. JA said they would and they were making sure there are proper facilities ready when they start doing it. I had pointed out a CAC PCGS coin that I have with a little green blob. It’s tiny but there. He said stuff like that would be taken care of gratis (most likely) since it was missed when they beaned it. Of course that was then and who knows what will happen later.