Log in or Sign up
Coin Talk
Home
Forums
>
Coin Forums
>
US Coins Forum
>
Did it CAC? 1832 Half Dime
>
Reply to Thread
Message:
<p>[QUOTE="Publius2, post: 8050264, member: 105571"]The scratches/hairlines are not on the holder, they are on the coin and I mentioned them in the original post. They are so small that they can't be seen with the naked eye and I didn't even know they were there until I saw my photographs. Then, I couldn't detect them with a 5X loupe. They only showed up when I used a 10X loupe.</p><p><br /></p><p>In another thread that [USER=24314]@Insider[/USER] started on the definition of a scratch, I mentioned that the limit of the 20/20 unaided human eye is 10 microns, which is 0.000393701 inches, but let's just call it 0.0004". That is 4 ten thousands of an inch. A human hair is about 70 microns +- 20.</p><p><br /></p><p>This little half dime is 6/10's of an inch in diameter. What do you think the width of those hairlines might be?</p><p><br /></p><p>So, I'm not at all sure calling these marks scratches or even hairlines is appropriate. It is one of the problems of high resolution photography in that it magnifies "defects" that are so small that they wouldn't signify in any normal environment.</p><p><br /></p><p>And one other thing about hairlines: The TPGs routinely straight-grade MS and PF coins with hairlines. They may, and often do, knock the grade down for them. And individual collectors are of course free to consider them how they like irrespective of what the TPGs do.[/QUOTE]</p><p><br /></p>
[QUOTE="Publius2, post: 8050264, member: 105571"]The scratches/hairlines are not on the holder, they are on the coin and I mentioned them in the original post. They are so small that they can't be seen with the naked eye and I didn't even know they were there until I saw my photographs. Then, I couldn't detect them with a 5X loupe. They only showed up when I used a 10X loupe. In another thread that [USER=24314]@Insider[/USER] started on the definition of a scratch, I mentioned that the limit of the 20/20 unaided human eye is 10 microns, which is 0.000393701 inches, but let's just call it 0.0004". That is 4 ten thousands of an inch. A human hair is about 70 microns +- 20. This little half dime is 6/10's of an inch in diameter. What do you think the width of those hairlines might be? So, I'm not at all sure calling these marks scratches or even hairlines is appropriate. It is one of the problems of high resolution photography in that it magnifies "defects" that are so small that they wouldn't signify in any normal environment. And one other thing about hairlines: The TPGs routinely straight-grade MS and PF coins with hairlines. They may, and often do, knock the grade down for them. And individual collectors are of course free to consider them how they like irrespective of what the TPGs do.[/QUOTE]
Your name or email address:
Do you already have an account?
No, create an account now.
Yes, my password is:
Forgot your password?
Stay logged in
Coin Talk
Home
Forums
>
Coin Forums
>
US Coins Forum
>
Did it CAC? 1832 Half Dime
>
Home
Home
Quick Links
Search Forums
Recent Activity
Recent Posts
Forums
Forums
Quick Links
Search Forums
Recent Posts
Competitions
Competitions
Quick Links
Competition Index
Rules, Terms & Conditions
Gallery
Gallery
Quick Links
Search Media
New Media
Showcase
Showcase
Quick Links
Search Items
Most Active Members
New Items
Directory
Directory
Quick Links
Directory Home
New Listings
Members
Members
Quick Links
Notable Members
Current Visitors
Recent Activity
New Profile Posts
Sponsors
Menu
Search
Search titles only
Posted by Member:
Separate names with a comma.
Newer Than:
Search this thread only
Search this forum only
Display results as threads
Useful Searches
Recent Posts
More...