Good question.... and when looking at an actual board, how is one to determine visually if we are looking at "staining" or "oxidation/corrosion"? Inquiring minds want to know. (many would say that even oxidized boards are solderable and acceptable. right? I think I just read that somewhere...) Jack . On Tue, 8 Feb 2011 09:20:44 -0500, Glidden, Kevin <[log in to unmask]> wrote: >Morning everyone, >I have a question on IPC-4553, specifically, section 3.1 "Visual", and specifically regarding staining of immersion silver. The text states "The coverage shall be complete and the finish shall be uniform on the surface to be plated (see Figures 3-1 through 3-5 for properties visually identified with IAg plated surfaces)" Figure 3-1 shows 'Example of Uniform Plating", with no staining. Figures 3-2 through 3-5 show staining. Is this to imply (without text to support) that any staining of immersion silver is determined to be non- uniform and therefore a defect? >Thanks. > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/ContentPage.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------