Specific Gravity testing

Discussion in 'Silver' started by No1joey, Jan 10, 2012.

  1. No1joey

    No1joey Member Silver Stacker

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    Hi all

    Few people mentioned they needed assistance with this test

    I received another dodgy looking coin from a reputable eBay seller which weighed perfectly, pinged sweetly, but as this test shows is fake.

    decided to use this with another maple I had to show how well this test works. All you need are scales.

    [youtube]http://www.youtube.com/watch?v=tMP_IiyJWHg[/youtube]

    [youtube]http://www.youtube.com/watch?v=MVOdBGz5-j0[/youtube]
     
    No1joey, Jan 10, 2012
    #1
  2. errol43

    errol43 New Member Silver Stacker

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    So does that mean you can't just go on weight no longer?

    Regards Errol 43
     
    errol43, Jan 10, 2012
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  3. No1joey

    No1joey Member Silver Stacker

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    Yes. Or ping.
     
    No1joey, Jan 10, 2012
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  4. Clawhammer

    Clawhammer Well-Known Member Silver Stacker

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    Will this work in beer?
     
    Clawhammer, Jan 10, 2012
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  5. Spode

    Spode Member

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    Thanks, this helps a lot. You do also need to make sure your scales actually work! I have just found most of my stack is either fake, or in reality, the scales are buggered. Given where I got the coins from, namely the Perth Mint, I think it's the scales. If you buy a cheap set of scales on eBay they may or may not be accurate!
     
    Spode, Jan 10, 2012
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  6. skipau

    skipau Member Silver Stacker

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    so now we need a fake scales thread!
     
    skipau, Jan 10, 2012
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  7. Fykus

    Fykus Member Silver Stacker

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    thanks for the video.
     
    Fykus, Jan 10, 2012
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  8. Austacker

    Austacker Active Member

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    Just adding a big thanks also. Simple and easy to do, apart from tying the dental floss to a round coin LOL I always had doubt on a couple of items.

    They returned a 10.5 and a 10.36 this one was at 31.1 close enough for me anyway.
     
    Austacker, Jan 10, 2012
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  9. Ozi

    Ozi Member

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    how do Perth Mint check for fake silver coins they buy back?
     
    Ozi, Jan 10, 2012
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  10. Austacker

    Austacker Active Member

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    I know before they would only accept things like ASE, Maples etc... I noticed the other day they had a XRF at each station. I doubt this is for coins, probably jewelry and nuggets I would say.
     
    Austacker, Jan 10, 2012
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  11. 66tbird

    66tbird New Member

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    What was the dimensional change on the fake?
     
    66tbird, Jan 10, 2012
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  12. No1joey

    No1joey Member Silver Stacker

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    It was about a mm thicker
     
    No1joey, Jan 11, 2012
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  13. sky_high

    sky_high New Member

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    How is 10.17 ? Close enough?
     
    sky_high, Jan 14, 2012
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  14. Ag

    Ag Well-Known Member Silver Stacker

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    Suggest you retest - not close enough - should be able to obtain 10.45 to 10.55 min

    Whats the item your testing?

    Whats the resolution of the scales?

    Anything else you can test to compare results?
     
    Ag, Jan 14, 2012
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  15. sky_high

    sky_high New Member

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    Getting from 10.17 up to 10.37 on multiple tests
     
    sky_high, Jan 14, 2012
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  16. No1joey

    No1joey Member Silver Stacker

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    If your getting 10.37 most likely it's fine scales might be a bit off
     
    No1joey, Jan 14, 2012
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  17. Ag

    Ag Well-Known Member Silver Stacker

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    Ok you need better scales - 3 decimal points - fleabay have then for around $10 delivered. Think you experiencing some bad rounding errors from the scales

    Is the 5oz bar 'machined' (like Perth mint smooth finish) or is it rough cast (dimples and holes)? The bar is 999 and not 925?

    Believe it or not but silver is porous! I have had odd and lower results on 'rough' bars so your probably safe
     
    Ag, Jan 14, 2012
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  18. sky_high

    sky_high New Member

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    Yes its the scales. By adjusting the weight difference of 0.1 it goes to 10.48.

    Or 0.1 may even be the string used.
     
    sky_high, Jan 14, 2012
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  19. Ag

    Ag Well-Known Member Silver Stacker

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    Ag, Jan 14, 2012
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