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Dissolving Nickel while leaving Copper Unaffected?

What chemicals and processes could I use to dissolve Nickel while leaving Copper unaffected in a copper-nickel amalgum. The actual purpose is dissolving higher-content nickel mixtures more than lower-content nickel, higher content copper mixtures.

Thanks!

Ed. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).

Stitt
Restoration - Las Vegas, Nevada, USA
December 6, 2011

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