Log in or Sign up
Coin Talk
Home
Forums
>
Coin Forums
>
Error Coins
>
Overheated Planchet or PMD on 2017P Nickel?
>
Reply to Thread
Message:
<p>[QUOTE="JCro57, post: 3218626, member: 92083"]No bother at all...</p><p><br /></p><p>Annealing is a process where coin blanks are heated in an oven before they are struck by the dies. This is done to soften the metal, which actually also helps <i>strengthen </i>the metal. If this process is bypassed, a coin blank remains brittle and could possibly crack, split apart, or even sort of shatter when great pressure is applied from the force of the die-striking process. </p><p><br /></p><p>If left in the annealing oven too long, silver-colored coins that are copper-based (for example, nickels are 75% copper, and clad coins have a copper core and are also plated with a copper-nickel alloy) can sometimes result in copper atoms shifting to the surface which makes them now a rusty-looking copper color, or can be dark like a grey or black, or even pink, brown, or can appear spotted - even only affected on one side. Some felt this was due to copper dust leftover in the annealing oven left from previous batches of coins, which then settled on other coins (sintered actually means going from powder right to a solid without liquidation). These were once called "sintered" or "copper wash" coins.</p><p><br /></p><p>When ejected from the striking chamber, the edges rub the collar (much more so if a coin has reeded edges) on the way out. Thus, edges should appear with a silver color instead of the deep red or grey/black.</p><p><br /></p><p>I have seen many coins at shows where dealers are selling these as improperly annealed, but almost every single one that I've seen is really just a damaged coin, and many of these are just environmentally damaged from the elements.</p><p><br /></p><p>Unfortunately, it is my opinion that your coin actually looks like it has environmental damage.[/QUOTE]</p><p><br /></p>
[QUOTE="JCro57, post: 3218626, member: 92083"]No bother at all... Annealing is a process where coin blanks are heated in an oven before they are struck by the dies. This is done to soften the metal, which actually also helps [I]strengthen [/I]the metal. If this process is bypassed, a coin blank remains brittle and could possibly crack, split apart, or even sort of shatter when great pressure is applied from the force of the die-striking process. If left in the annealing oven too long, silver-colored coins that are copper-based (for example, nickels are 75% copper, and clad coins have a copper core and are also plated with a copper-nickel alloy) can sometimes result in copper atoms shifting to the surface which makes them now a rusty-looking copper color, or can be dark like a grey or black, or even pink, brown, or can appear spotted - even only affected on one side. Some felt this was due to copper dust leftover in the annealing oven left from previous batches of coins, which then settled on other coins (sintered actually means going from powder right to a solid without liquidation). These were once called "sintered" or "copper wash" coins. When ejected from the striking chamber, the edges rub the collar (much more so if a coin has reeded edges) on the way out. Thus, edges should appear with a silver color instead of the deep red or grey/black. I have seen many coins at shows where dealers are selling these as improperly annealed, but almost every single one that I've seen is really just a damaged coin, and many of these are just environmentally damaged from the elements. Unfortunately, it is my opinion that your coin actually looks like it has environmental damage.[/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
>
Error Coins
>
Overheated Planchet or PMD on 2017P Nickel?
>
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...