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If they are really solid gold coins, just about any strong
acid should do the trick - watered-down battery
acid should work well.

-Will

On Mon, 22 Dec 1997, Rod Budd wrote:

> Hi
> 
> We recently came across 2  gold soveriegns while diving a wreck here 
> in NZ. 
>  They are covered in what looks like iron oxide and some  other black 
> stuff.  Can anyone tell me the best way to remove the 'gunk' without 
> damaging the coins? 
> 
> Thanks and Merry Christmas
> 
> ...R
> 
> Rod Budd
> NIWA, National Institute of Water & Atmospheric Research
> P.O. Box 11-115, Hillcrest, Hamilton, 
> New Zealand
> +64 7 856-1718 (tel) 856-0151 (fax) 
> +64 25 734-066 (mob)
> r.budd@ni*.cr*.nz*    http://www.niwa.cri.nz
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