[Jewelry making - Article 00209] - Re: [Orchid] Fine gold colouring on lower carats

[Nileshhk]

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    Could someone please elaborate the Pottassium Nitrate/Alum/Salt
    method. Am  I correct when I understand that it is a surface
    depletion process?. 

Thanks & Regards, 
Nilesh Gupta 


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