Hi Ed,

I use peelable latex mask quite often here (mostly for conformal coat
masking) and have never had it tarnish ENIG. I do know that some masks
contain some ammonia (some formulations more than others) and the ones that
do usually have a note not to use on OSP finishes, but I've not seen such a
note for ENIG. IHMO you got something else going on there besides the
peelable mask causing the problem...

Steve

On Wed, Oct 7, 2015 at 2:46 PM, Ed Popielarski <[log in to unmask]>
wrote:

> Hi all,
>
> I Have a batch of boards showing what I believe to be black pad. This is
> surfacing at thru hole (solderability, some pads are turning orange). One
> person suggested the peelable solder mask contains ammonia and this is what
> is causing it. I disagree.
>
> Suggestions or comments?
>
> Ed Popielarski
> Engineering Manager
>
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