Wayne Yes, the staining on ground plane not affect 3F, because it were not soldered so it were stained during production time and looked so bad about cosmetic. Can you advise how to treat of stain? We not confident to delivery to customer these boards. Thanks Tuyen Tran ________________________________________ From: TechNet [[log in to unmask]] On Behalf Of Wayne Thayer [[log in to unmask]] Sent: Thursday, July 17, 2014 10:57 PM To: [log in to unmask] Subject: Re: [TN] Staining immersion silver coating on ground plane after assembling What's to solve? Apparently the boards soldered OK, so it sounds like you are only talking about cosmetics. No long term reliability problem. Talking with the PCB supplier about getting an anti-tarnish applied over the ImAg will help with the cosmetics. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Tuyen Tran Sent: Thursday, July 17, 2014 11:42 AM To: [log in to unmask] Subject: [TN] Staining immersion silver coating on ground plane after assembling Hi Everyone We received some PCBs where the finish surface was good, but after we ran reflow about ten days, the ground plane with immersion silver coating that were not covered by solder paste look to be stained on surface. We known the chemical silver [Immersion Silver finish] surface is very sensitive to surrounding condition, it is easy to stain from oxygen/water vapour or production time exposure in the air. We are looking for document on staining metal of the finished board. Has anyone else experienced something similar phenomenon or anyone have an idea to solve this? Thanks Tuyen Tran. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________