Focus on the Rusts on Gold Bars

Discussion in 'Gold Coins' started by flora095, Jan 17, 2013.

  1. flora095

    flora095 New Member

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    flora095, Jan 17, 2013
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  2. Eureka Moments

    Eureka Moments Well-Known Member Silver Stacker

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    Oxygen?
     
    Eureka Moments, Jan 17, 2013
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  3. Dan Unda

    Dan Unda Member Silver Stacker

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    Dan Unda, Jan 17, 2013
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  4. Clawhammer

    Clawhammer Well-Known Member Silver Stacker

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    Gold and iron don't mix into alloys, so you can rest assured the gold is pure.

    My bet is iron particles have flaked off the mould or dies used to produced the coins and bars and become imbedded into the surface of the peice.

    It looks ugly... but its still pure
     
    Clawhammer, Jan 17, 2013
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  5. Marco55

    Marco55 Member

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    75% Gold does alloy with 25% Iron to make Blue Gold.
     
    Marco55, Jan 17, 2013
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  6. Clawhammer

    Clawhammer Well-Known Member Silver Stacker

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    Technically you're refering to "oxide layer blue-gold" where you're looking through a layer of oxidised iron (rust) on the surface of the gold piece similar to the 'blue' used to protect firearms. In this case while the two metals are together (mixed), they're not bonded as a true alloy.

    Any other blue colours comes from gold being alloyed with varying amounts of Indium.

    but they're getting there...with nano-magnets :cool:

    http://www.newscientist.com/article...alloy-shows-power-of-magnetic-attraction.html
     
    Clawhammer, Jan 17, 2013
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