Coin Community Family of Web Sites Join Thousands of Coin, Bullion, & Money Collectors
Royal Canadian Mint products, Canadian, Polish, American, and world coins and banknotes. Join Thousands of Coin, Bullion, & Money Collectors Vancouvers #1 Coin and Paper Money Dealer Coin, Banknote and Medal Collectors's Online Mall Specializing in Modern Numismatics 300,000 items to help build your collection! Royal Estate Auctions - $1 Coin Auctions








Username:
Password:
Save Password
Forgot your Password?


This page may contain links that result in small commissions to keep this free site up and running.

Welcome Guest! Registering and/or logging in will remove the anchor (bottom) ads. It's Free!

Testing Silver Question.

To participate in the forum you must log in or register.
Author Previous TopicReplies: 19 / Views: 3,800Next Topic
Page: of 2
Pillar of the Community
MisterT's Avatar
United States
2003 Posts
 Posted 04/30/2021  3:26 pm  Show Profile   Bookmark this reply Add MisterT to your friends list Get a Link to this Reply
Grant, you seem well versed in science and theory but I urge you to try to conduct a specific gravity test on a coin immersed in water. Try it completely suspended without touching the bottom or sides and record the reading of the displacement. Then try the same test with the coin touching the bottom or the sides. In my experience of doing this many times, there is indeed a difference in the reading. The test leaves no room for error because even a miscalculation of 0.01 grams will significantly alter the result.
Valued Member
SueCoin's Avatar
United Kingdom
126 Posts
 Posted 04/30/2021  8:04 pm  Show Profile   Bookmark this reply Add SueCoin to your friends list Get a Link to this Reply
Mr T I pity the fool! I guess we are like you and Murdoch in the actual A Team. At least you tolerate me and hopefully drive a huge black red striped interceptor.
We need to actual get into this in depth (rubbish Pun) theoretical displacement concept relies on the for example metal object. It will shrink or expand with temperature. Affecting the displacement of the immersion media. Water for example is charged so we notice a surficant phenomena around the edges. It's the water molecular properties as they are stable in th he centre as they push equally. At the edges Surface Tension is observed shoving water up as the molecules have no neighbours to balance for example Capillary Action forcing water up a thin tube.
You are also clearly an extremely knowledgeable person. Am sure between the two of us we can work out the discrepancies you have observed.
I doubt they will give us Nobel Peace Prize but Hannibal will chew a Cigar and anounce I love it when a plan comes together!
Love your stuff Mr T. Food for thought.
Grant
Pillar of the Community
MisterT's Avatar
United States
2003 Posts
 Posted 04/30/2021  9:43 pm  Show Profile   Bookmark this reply Add MisterT to your friends list Get a Link to this Reply
Grant, I have a feeling we are on the same chapter but perhaps different pages. What I mean is that the specific gravity test I am referring to is one which compares the weight of the coin in its "dry" state vs the weight of the coin in solution (distilled water). The weight in solution is then divided into the "dry" weight to give you the specific gravity reading. I have a feeling that you may be measuring the actual volume of fluid displaced by the immersion. Most of the time my coins fall within the correct weight parameters and there is usually no need for this type of testing. On the other hand when a coin is above or below the normal weight range, I like to verify it with this specific gravity test. I was able to detect a counterfeit Trade dollar using this method because it came back with a specific gravity of 8.72 which is more like copper. sure enough when I filed the edge of the coin it was copper underneath.
Valued Member
SueCoin's Avatar
United Kingdom
126 Posts
 Posted 05/01/2021  5:41 pm  Show Profile   Bookmark this reply Add SueCoin to your friends list Get a Link to this Reply
Humbled. That's a very fair assessment of my if am honest naivity. I get it now. I used to only consider it testing my banger cars battery acid. I humbly apologise Mr T. Am deep in study on your actual reality. I actually am wrong all the time!
Luckily I have friends like you.
Grant
  Previous TopicReplies: 19 / Views: 3,800Next Topic
Page: of 2

To participate in the forum you must log in or register.



    




Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited.
Contact Us  |  Advertise Here  |  Privacy Policy / Terms of Use

Coin Community Forum © 2005 - 2026 Coin Community Forums
It took 0.21 seconds to rattle this change. Forums