NGC Slab W/ Halo Yellowing Of White Foam Insert Around The Coin

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Author	Replies: 6 / Views: 2,164
Collects82 Pillar of the Community United States 1316 Posts	Posted 04/17/2017 12:10 pm Hi, I just received thisNGS slabbed El Cazador coin 8R (1782 Limae) and I am curious as to why the white insert/foam piece that holds the coin has developed a light yellowing halo around the coin. Is this normal for an older slab? As it is sea salvage, is there a reaction happening with sea residue? Is this something I should care about? Is a reholdering going to be necessary? This is a very rare mint/year combination from the wreck and is one of the "jewels" of my collection of the '82s, so I want to ensure it is as safe as possible. Here are a couple photos, but the yellowing is rather light and may not show up too well in the photos. It extends about .25" around the coin Thanks! Report this Post to the Staff

Chute72 Pillar of the Community United States 1314 Posts	Posted 04/17/2017 1:49 pm My first guess would be a contamination from the coin. I might be from the sea water, but it could also be from a hundred other home brewed cleaners/preservatives. I would call NGC, explain the situation and ask about a conservation with reholdering. You might also crack it open and bath it in acetone, then resubmit. Report this Post to the Staff
Collects82 Pillar of the Community United States 1316 Posts	Posted 04/19/2017 12:38 pm Thank you! I have reached out to NGC :) Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 04/19/2017 3:43 pm NGC/NCS has a great deal of experience with salvaged coins, I have a hard time believing that any sort of sea water residue would be left on the coin before encapsulation. I would say it is much more likely that it is an issue with the insert itself. Something as simple as fluorescent lighting can discolor certain plastics over time. Quote: You might also crack it open and bath it in acetone, then resubmit. Bad advice, that would destroy the provenance. Report this Post to the Staff
BStrauss3 Pillar of the Community United States 4594 Posts	Posted 04/19/2017 4:53 pm Also it's a hard plastic, not foam. -----Burton 50+ year / Life / Emeritus ANA member (joined 12/1/1973) Life member: Numismatics International, CONECA Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club Owned by three cats and a wife of 40+ years (joined 1983) Author: 3rd Edition of the Sample Slabs book, https://www.sampleslabs.info/ Report this Post to the Staff
Conder101 Bedrock of the Community United States 17884 Posts	Posted 04/20/2017 12:20 pm It isn't foam, but it isn't a hard plastic either. If they are using a dollar size insert the coin is slightly larger than a dollar and it might be compression stress in the insert plastic. Report this Post to the Staff
Andrew99 CCF Advertiser United States 1533 Posts	Posted 04/26/2017 10:56 am I haven't cracked open an NGC holder lately, but I thought it was Teflon. It certainly looks like Teflon. Light exposure over time can yellow many plastics. I think its just a $10 reholder to take care of this. Report this Post to the Staff
	Replies: 6 / Views: 2,164

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