A reducing gas plasma works well.  Typically up to 10% Hydrogen in an inert gas
such as Argon or Nitrogen.  Forming gas is one example.  I have customers who
use 100% Hydrogen plasma, I do not recommend this.  Bill Moffat

-----Original Message-----
From: mems-talk-bounces+bmoffat=yieldengineering.com@memsnet.org [mailto:mems-
talk-bounces+bmoffat=yieldengineering.com@memsnet.org] On Behalf Of Shay
Sent: Wednesday, July 20, 2011 11:03 PM
To: 'General MEMS discussion'
Subject: Re: [mems-talk] Removing oxide from Silver Die

What's the oxide thickness? Or is it just the black tarnish which is usually
sulfides?

Shay