Counterfeit Silver Dollars Passing the Test

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gary213
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Re: Counterfeit Silver Dollars Passing the Test

#11 Unread post by gary213 » Fri Jul 24, 2015 11:20 pm

1) acid test on stone, rubbing edge, yes. I wiped off after about 8 seconds. I deal in many antiques and test all "potential" gold, silver and platinum.
2) Yes, same procedure for all gold and silver.



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PALH1
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Re: Counterfeit Silver Dollars Passing the Test

#12 Unread post by PALH1 » Fri Jul 24, 2015 11:31 pm

& a magnet has no attraction to these coins...?
:eureka:
as nickel is a "ferromagnetic" metal...

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mhonzell
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Re: Counterfeit Silver Dollars Passing the Test

#13 Unread post by mhonzell » Sat Jul 25, 2015 12:19 pm

Most metals aren't magnetic with the exception of iron, nickel, cobalt, gadolinium, neodymium and samarium.
(Funny, I work with all of these.)

Anyway, posting pictures is fairly easy.
Just use the Full Editor when writing your reply.
Then, scroll down under the reply and you will see an "attachment" tab for entering photos.
Capture.PNG
Capture.PNG (3.98 KiB) Viewed 1422 times


Here's a test to tell all without subjecting a coin to acid:
Coin Specific Gravity
Specific gravity determines how much water is displaced by the mass of the coin. Only an authentic Morgan Silver dollar will have a specific gravity of 10.340.

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PALH1
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Re: Counterfeit Silver Dollars Passing the Test

#14 Unread post by PALH1 » Sat Jul 25, 2015 12:54 pm

m, remember SG is a 'volume' measurement, as 'displacement'.....
:eureka:
so, if i calculate only by the "numbers".....using nickel @ 8800 Kg/m3, & silver @ 10,049 Kg/m3.....then a 'nickel coin' of this size would be:
22.42364g

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Re: Counterfeit Silver Dollars Passing the Test

#15 Unread post by mhonzell » Sat Jul 25, 2015 1:34 pm

That's true if it is the exact size of a Morgan. If the counterfeiter mixed lead and tin to get the weight right, then the volume would only need to be slightly off, the weight would be right, it would not be magnetic, but the specific gravity would still be wrong.

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Re: Counterfeit Silver Dollars Passing the Test

#16 Unread post by PALH1 » Sat Jul 25, 2015 1:54 pm

:agree: m,
although, i can't see "50" different so called 'dealers'........
:eureka:
& we know the 'real fakes' would be 'AU-ish / XF+' looky-loos

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