Found A 1972 D Kennedy Half Dollar In Silver - Page 4

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Author	Replies: 55 / Views: 16,671	Page: of 4

SteveCaruso Pillar of the Community United States 1796 Posts	Posted 12/15/2014 08:53 am The normal battery of tests at The Black Cabinet should be more than sufficient. Report this Post to the Staff
mdpmedia Pillar of the Community United States 3546 Posts	Posted 12/17/2014 05:55 am Quote: normal battery of tests at The Black Cabinet.. Be careful not to take for gospel all that is written on this web site w/r/t to the diamagnetism test & its applicability to verifying Ag (silver) coins. The following statement appears on Black Cabinet: "Criteria #3: Diamagnetism If it doesn't stick to a magnet, then we can test for a diamagnetic reaction. For this, however, you will need a very strong neodymium button magnet, which you can purchase at most scientific supply stores. Slide the magnet down the surface of the coin. If it slides swiftly off the surface with little to no resistance, it's likely a fake. If the coin is made of silver, a magnet should slide very slowly over its surface. Be careful not to interpret a false-positive, though, as a magnet will also slide slowly over other metals such as copper, aluminum, and lead; however, it will slide noticeably slower over sliver. Be sure to check the slide with a genuine silver piece of the same fineness for reference." Make your own decision insofar as applicability after viewing this seven minute youtube video clearly showing virtually no difference between clad and Ag coins using this test: 1erTYcQliYQ If you do not wish to watch the entire video, then check out only Mercury vs modern dimes at 3:06. regards, mdpmedia * Edited by Staff to add YouTube tags. Please use them in the future. We prefer embedded video. * Report this Post to the Staff
SteveCaruso Pillar of the Community United States 1796 Posts	Posted 12/17/2014 07:52 am This video also uses a swing rig which is not by any means the most efficient method and is horridly imprecise. It is certainly dramatic for larger coins, though, but is completely insufficient for smaller ones like quarters and dimes where it is not nearly precise enough to observe the differences between the stronger diamagnetic force of silver vs the weaker force of copper. :-) This is why sliding a magnet directly over the face of the coin through a flip (or vice versa, i.e. sliding the coin in a slip over an inclined surface of a bigger magnet or an embedded magnet) is best. No test, should never be taken as proof in isolation. Edited by SteveCaruso 12/17/2014 07:55 am Report this Post to the Staff
gotboostedvr6 Valued Member United States 261 Posts	Posted 12/17/2014 1:36 pm You can use a gold acid test kit to test for silver using the 18k acid. Use the rim of the coin and scratch the black stone till it leaves a silver colored mark. Drip a small amount of 18k acid on the mark. If the coin has any silver in it the scratch will turn navy blue. It doesn't get any simpler then that. Report this Post to the Staff
Conder101 Bedrock of the Community United States 17884 Posts	Posted 12/17/2014 1:49 pm Why is it no one ever pays attention when I suggest a Specific Gravity test? Nondestructive, cheap, and in cases like this conclusive. Report this Post to the Staff
SteveCaruso Pillar of the Community United States 1796 Posts	Posted 12/17/2014 4:37 pm Because it's usually messy... Conclusive, but messy. :-) Report this Post to the Staff
mdpmedia Pillar of the Community United States 3546 Posts	Posted 12/17/2014 5:02 pm Quote: ...I suggest a Specific Gravity test.. I would tend to agree with this type of test. However, it would be very helpful if someone could recommend an accurate, portable, and economical SG machine that one could lug around in their car's trunk. This machine would be nice to use since many CCF folks look down upon the scratching of a coin's rim on a stone for subsequent testing with acid. Although it appears to be harmless, I do have to agree that it is nonetheless destructive in nature. I can personally vouch for this since once I owned up to performing this scratch test on the rim of a gold coin before and felt like I was excoriated in the thread. Now I know better and feel that SG testing is the way to go IMHO. Report this Post to the Staff
smokeriderdon Pillar of the Community United States 3755 Posts	Posted 12/17/2014 9:42 pm OK, I get that there are times when these tests might be something to consider. But, this is NOT one of those times. The test here is, what date is it? 1972? NOT silver. Done. Report this Post to the Staff
jgfindring Rest in Peace United States 1380 Posts	Posted 12/17/2014 10:17 pm Since the OP hasn't been back in two weeks and has seen none of these suggestions, it's kind of moot now guys. Report this Post to the Staff
jbuck Moderator United States 189673 Posts	Posted 12/18/2014 10:28 am Quote: Since the OP hasn't been back in two weeks and has seen none of these suggestions, it's kind of moot now guys. We have ten guest lurkers for every member viewing this thread. Maybe someone, somewhere is being helped. Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
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