Coin grading question...

I had some modern silver proof coins that toned slightly on the reeded edge...I then sent them to NGC for grading. Should I have had these conserved to remove the toning...or will the toning stabilize once in the slab?

 

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I would NOT have conserved them. There is nothing wrong with edge toning, and some collectors even prefer it.

Yes, the toning should stabilize to a certain extent from being in a slab. However, slabs are not airtight and if stored in a "bad" place will only slow down the toning and not stop it. So don't think because it's in a slab that it is safe -- that is not entirely true.

To stop a coin from toning you need to (a) limit the humidity, (b) limit the airflow, and (c) limit the temperature fluctuations.

 

THanks. Yeah all my slabs are stored in archive safe ziplock bags. BTW has anyone developed a wood case or case for the large NGC style holders?

 

I am not aware of such a case, but I do seem to recall a few custom cases for sale at FUN over they years that would likely work.

Wood would not be my first or second or third choice for coin storage.

 

shoe box

 

Mine either.

 

Well I like the slabs to be in velveted slots so the surface does not get scratched...a scratched slab is a scratched coin.

 

There are moderns with milk spots that have even graded "70". It shouldn't affect grade.

 

I have seen custom made wood boxes, slotted for slabs and lined with velvet on eBay. It was expensive though at around $75 I think.

 

I make wood cases for slabbed coins. all oak with felt lining. have had some for almost ten years. no negative effect on the coins in slabs. I don't see what's in felt to bother them?

 

Related to this post as it involves the same coins I am discussing...NGC returned them today...one proof coin had a grease smudge on it that was not on it when I sent it in. Can they remove this/will they correct this? The coins I shipped them were perfect un-touched. Looks like a knuckle bumped the surface.

 

The smudge definitly showed up on the coin after being sent to NGC. I am OCD about these coins haha and I know every detail. These were all mint fresh coins. Also, the fingerprints on the same area on 3 coins...3 coins from different mints and sources that I am the sole owner of.

 

I've had similar experiences but its very difficult to prove unless you have definitive before and after photographs. There has to be something of the coin that specifically sets it apart from a similar coin and with proofs, this can be quite challenging.I submitted a 1971-S to PCGS a year or so ago for TrueView photography and when the photo was returned, I saw this:



I do not "remember" this on the coin when I submitted it and surely, with my incredibly discerning eye, would have remembered this. BUT.........I didn't. The scans I have of the coin showed silimar marks that the TrueView simply highlighted.

 

Yeah that is a tricky defect. But the coins I sent were large flawless proof kilos...2 Liberian and 1 Cook Island Perth Mint issue. NO marks on any and now they return with crystal clear fingerprints in the upper corner of three. They are the same size and shape print. NGC nicely told me to return and they would correct.

 

Great!

 

Yes. Its the same fingerprint in the same place on 3 coins...and it is very clear. The surfaces were flawless prior to submission. They can use some type of solvent Im sure.