----- Original Message -----

From: [log in to unmask]>Ken Mc Gowan

To: [log in to unmask]>[log in to unmask]

Sent: Monday, April 09, 2001 10:49 PM

Subject: Re: [TN] Immersion silver boards tarnish

Hi David,

 

Normal mechanisms of Ag tarnishing are:

 

Diffusion of copper (do you have a brrier layer of Ni/Pd??)

 

Presence of sulphides in the atmosphere.

 

Organic stuff in packaging materials.

 

Best Regards,

 

Ken McGowan.

----- Original Message -----

From: [log in to unmask]>David

To: [log in to unmask]>[log in to unmask]

Sent: Monday, April 09, 2001 1:53 AM

Subject: [TN] Immersion silver boards tarnish

Has anyone ever exeprienced immersion silver MSP boards tarnishing, turned yellow after stored in ambient condition?