Log in or Sign up
Coin Talk
Home
Forums
>
Coin Forums
>
Coin Chat
>
Silver Tissue Test
>
Reply to Thread
Message:
<p>[QUOTE="desertgem, post: 1898297, member: 15199"]Although this simple trick may work well with certain light and tissue, one should consider the above mentioned coin surface problem. Toning ( interference layers ) and random roughing of surface from wear or corrosion can cause bad results. Below is graph showing 'perfect' reflectivity of some metals in reference to the light spectrum. I doubt the human eye has the ability to detect new tin from new silver. Luckily, pure tin corrodes relative rapidly and isn't commonly used for coins. The tissue test measures reflectivity and is not accurate below the surface of the coin , so coins plated with pure silver will pass the test. It can not detect counterfeits from the correct metal mixture.</p><p><br /></p><p><img src="http://72.52.202.216/%7Efenderse/Minoan_Mirror/Reflectivity_Graph_450px.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>
[QUOTE="desertgem, post: 1898297, member: 15199"]Although this simple trick may work well with certain light and tissue, one should consider the above mentioned coin surface problem. Toning ( interference layers ) and random roughing of surface from wear or corrosion can cause bad results. Below is graph showing 'perfect' reflectivity of some metals in reference to the light spectrum. I doubt the human eye has the ability to detect new tin from new silver. Luckily, pure tin corrodes relative rapidly and isn't commonly used for coins. The tissue test measures reflectivity and is not accurate below the surface of the coin , so coins plated with pure silver will pass the test. It can not detect counterfeits from the correct metal mixture. [IMG]http://72.52.202.216/%7Efenderse/Minoan_Mirror/Reflectivity_Graph_450px.jpg[/IMG][/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
>
Coin Chat
>
Silver Tissue Test
>
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...