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Gravity Test ? Need Help With This Very New To Ths

 
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Author Previous TopicReplies: 8 / Views: 387Next Topic  
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United States
137 Posts
 Posted 04/05/2020  10:23 pm Show Profile   Bookmark this topic Add JMart to your friends list Get a Link to this Message
Can you use regular drinking water for the gravity test
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United States
117 Posts
 Posted 04/05/2020  11:05 pm  Show Profile   Bookmark this reply Add Vindex to your friends list Get a Link to this Reply
I am assuming you are asking a question about determining the specific density of a coin? If it is a coin that matters, I would only use distilled water to perform the test. Also you will need a beaker that has a milliters measure to the 100ths. Most measuring cups will leaving you guessing. I have used this method for rocks, it will be harder to perform on a small coin. Also if you are trying to use it to test against a counterfeit coin, it could be made of material that is close to the specific gravity of the coin it is proposed to be.
Valued Member
United States
137 Posts
 Posted 04/05/2020  11:17 pm  Show Profile   Bookmark this reply Add JMart to your friends list Get a Link to this Reply
Ok I'm very new to this so I think I'll just hang on to it it's the s
1971 d Kennedy half dollar just seems different from all the others and feels a little heavier
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United States
1329 Posts
 Posted 04/05/2020  11:31 pm  Show Profile   Bookmark this reply Add fortcollins to your friends list Get a Link to this Reply
Here's a link to a post I did about specific gravity tests.

The test measures relative values, rather than absolute values. While distilled water is preferred, it is not essential.

I suspect that you are trying to distinguish between a silver clad half dollar (specific gravity 9.53) and CNC half dollar (specific gravity 8.92). The differences are large enough that ordinary tap water would not affect the relative numbers. Running the specific gravity test two or three times and averaging the results should provide enough consistency.
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United States
117 Posts
 Posted 04/05/2020  11:33 pm  Show Profile   Bookmark this reply Add Vindex to your friends list Get a Link to this Reply
$10 and you can have a gram scale delivered to your door that weighs to the 1/100th of a gram. Amazon.com

Your Kennedy should weigh 11.3 grams which is close to the weight of 2 State Quarters.
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Australia
16997 Posts
 Posted 04/06/2020  12:43 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
Before going to a specific gravity test, there are other more simple tests that can be applied first:

1. Weight (by itself),
2. Comparative ping tone test,
3. Post pictures here in the CCF, for opinions,
4. Ask a coin dealer.
5. Examine surface metal texture, style, fabric, XRF, check data bases for fakes, specific gravity test. (4. and 5. mainly for ancient coins.)
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United States
33632 Posts
 Posted 04/06/2020  05:18 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
You can also try the tissue test.
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
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United States
13443 Posts
 Posted 04/06/2020  08:00 am  Show Profile   Bookmark this reply Add T-BOP to your friends list Get a Link to this Reply

Quote:
You can also try the tissue test.

Isn't that just for 90% Silver ?
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Bedrock of the Community
United States
33632 Posts
 Posted 04/06/2020  08:32 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
Not sure. I would think it would look different than a 90% silver and different on a clad nickel.
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
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