I think we have to divide it to two:
1. Acceptance from the PCBs shopes - Stains is not acceptable
2. Stains of PCBs after few months in stock - may be acceptable

Reuven

On Wed, Feb 9, 2011 at 4:10 PM, Jack Olson <[log in to unmask]> wrote:

> 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.
> >
>
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