Log in or Sign up
Coin Talk
Home
Forums
>
Coin Forums
>
Coin Chat
>
Cleaning Zinc Coins - Results To Date
>
Reply to Thread
Message:
<p>[QUOTE="kanga, post: 4739817, member: 9270"]Test 1 - 5 coins</p><p>I totally botched the test.</p><p>No scans before, hence no comparison possible after.</p><p>NO RESULTS.</p><p><br /></p><p>Test 2 - 5 coins</p><p>I botched 80% (4 out of 5) of the test.</p><p>Therefore only one "before and after" comparison possible.</p><p>Here it is:</p><p><img src="http://www.dcderoo.com/Coin5End.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>Obviously the white spots were "changed".</p><p>But what disturbs me the most at this time is that the dark areas were lightened -- considerable.</p><p>Pure Guess: The dark areas were only mildly affected over time (75-80 years), but my treatment resulted in a light coating of ZnO.</p><p><br /></p><p>I've got more zinc coins to fuss with so this is not over.</p><p>I just need tighter standards for my process.</p><p>My college chemistry classes were about 55 years ago.</p><p>I've forgotten about careful control and recording of my testing parameters.</p><p>At least I'm not going anywhere thanks to COVID-19.[/QUOTE]</p><p><br /></p>
[QUOTE="kanga, post: 4739817, member: 9270"]Test 1 - 5 coins I totally botched the test. No scans before, hence no comparison possible after. NO RESULTS. Test 2 - 5 coins I botched 80% (4 out of 5) of the test. Therefore only one "before and after" comparison possible. Here it is: [IMG]http://www.dcderoo.com/Coin5End.jpg[/IMG] Obviously the white spots were "changed". But what disturbs me the most at this time is that the dark areas were lightened -- considerable. Pure Guess: The dark areas were only mildly affected over time (75-80 years), but my treatment resulted in a light coating of ZnO. I've got more zinc coins to fuss with so this is not over. I just need tighter standards for my process. My college chemistry classes were about 55 years ago. I've forgotten about careful control and recording of my testing parameters. At least I'm not going anywhere thanks to COVID-19.[/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
>
Cleaning Zinc Coins - Results To Date
>
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...