Another possibility is silver tarnish due to sulfides either in the air
(e.g., industrial pollution) or unsuitable packing materials such as
paper/cardboard containing sulfides.
Brian
Richard Kraszewski wrote:
> We are seeing yellow discoloration of Immersion Silver Boards right out
> of the package from our board house. They seem to solder fine, however
> this is causing some concern with our customer. I suspect that it could
> be a thin film of silver bromide or silver carbonate both which are
> yellow powders.
>
> Any one seen this before?
>
> What is it?
>
> How does the board house remedy this situation?
>
> Any associated concerns or other bits of wisdom?
>
> I would truly appreciate any input.
>
>
> Rich Kraszewski
>
> Advanced Manufacturing Engineer - KEDS
>
> Phone: 260.925.8919
>
>
>
>
>
>
>
>
>
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