| Author |
 Replies: 7 / Views: 1,054 |
|
|
Pillar of the Community
United States
715 Posts |
I have been looking through some rolls of cents I got recently, all of which are uncirculated 2016s. On most of the coins, there are the to-be-expected bag marks, though I find the occasional specimen with very very little in the way of contact marks. However, I still see lots of what looks like dried water marks (I don't know what to call these). How much does this impact grading? I wish I could get a good picture, but this will have to do for an example. Additionally, I feel like I struggle to differentiate 66 from 67 from 68. I end up trying to get this kind of intuitive sum grade from presence or lack of scuff and contact marks combined with overall eye appeal. While these pictures sort of suck for grading purposes, I'd like to hear some thoughts based on what you see anyway.   |
|
|
|
Valued Member
United States
344 Posts |
http://goccf.com/t/68544Quote:
It's residue from the metalworking fluid and/or post-rinse used during the coining process. During any type of metalworking process the fluid sumps become contaminated and unbalanced over time. Eventually, soaps form due to the interaction of metallic ions (copper, magnesium, calcium, etc.) in the water and fatty acids used in the fluids. These soaps can strongly adhere to metallic surfaces forming a semi-permanent bond and create a residue, i.e. spots. Once fully dried, the spots are irremovable without damaging the coins surface. These spots are very common on newly minted cents from what I've seen. I'm interested if anyone here knows anything about removing these stains?
Edited by Alex12780
03/31/2017 7:18 pm
|
|
Pillar of the Community
 United States
715 Posts |
Interesting, thank you for that information. I see these a lot, too. I hope that they're not a horrendous detriment to the grade, though obviously they affect eye appeal. Unless I've misunderstood, the technical grade is only going to be mitigated by about 1 point by eye appeal. Is that right?
|
|
Rest in Peace
10197 Posts |
Discussing w/Kenkat who graciuosly each year has given out new mint roll cents, seems to be a very common problem for the past four or more years. We never were able to determine the problem, thanks for the answer finally! Yea, they're permanent, dang it!  |
|
Rest in Peace
United States
17900 Posts |
Finding non-spotted cents is more difficult than finding high grade on most cents minted in the last few years.
50 years from now the toughest cents to find in high grade will be the zincolns, even with their huge mintage numbers.
|
|
Rest in Peace
United States
18456 Posts |
Yeah ,maybe it is time to ditch the Lincoln Cent because this problem is a good reason to do so . I'm a BU roll collector and I have seen my share of this plague . These zincolns are getting worse , first gas bubbles, then zinc rot and now soapy residue spots that's permanent . I don't know about you guys but I'm all for ending the business strike Lincoln Cents with the 2017-P as the last harah . We'll just keep them in proof sets and occasionally a special mint type set .    |
|
Bedrock of the Community
 United States
18654 Posts |
grading from 66 through 68 takes a lot of practice looking at previously TPG graded coins. the difference will be color and surface preservation where even the smallest mark can knock it one grade. on upper end coins I start with MS70 and subtract for scuffs or marks and color rather going the other way |
|
Pillar of the Community
United States
715 Posts |
Ah, that's very good to hear panzaldi. I thought maybe I just didn't have an understanding, as opposed to the lack of expertise. I've looked through so many of these darn 2016s my mind has started spinning. The pictured coin has almost no bag marks (although of course there are some), but those soap bubbles make it look pretty ech. I've put a few aside that were nicked the least, but I'm still feeling lost on how to grade them confidently. I'm sure they're in the 65-68 range, but that's a pretty huge gamut in a way.
|
| |
Replies: 7 / Views: 1,054 |
|
Posted 03/31/2017 7:06 pm
