James.,

Read

 " Etch Rates for Micromachining Processing-Part II "
Williams Eal IEEE,2003.

You will get the information.

Bala.




--- James Zhu  wrote:

> Dear all,
>
> I am looking for a silver etchant that will remover
> the silver film (100nm) (on top of copper layer (2
> micron thickness)) without attacking copper. Can
> anyone kindly share your information?