This is a good place to start:
http://www.ee.byu.edu/cleanroom/wet_etch.phtml

On Tue, Jun 3, 2008 at 11:59 AM, basar bolukbas 
wrote:

> Hello to everyone.
>
> I am looking for a chemical etchants which attacks to Ag layer but doesnt
> attack to Ni and Au layer in same time.
>