John,

If I ignore all previous comments on your post and look at this picture I 
see what we used to call an epoxy spot.

It appears that you can see copper through the contaminant that prevented 
the final plate.

We see this in flexible circuits too with no epoxy from prepreg to melt on 
the surface.

Often does occur after lamination.

Chuck


Charles W. Brummer | 3M Manufacturing Engineer
3M Electronic Solutions Division
3M Canoga Park, 8357 Canoga Ave. | Canoga Park, CA 91304
Office: 818 734 4930
[log in to unmask] | www.3M.com


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From:   Steve Gregory <[log in to unmask]>
To:     <[log in to unmask]>
Date:   07/30/2014 05:03 AM
Subject:        [TN] Spots on Gold
Sent by:        TechNet <[log in to unmask]>



Morning John,

I have your second photo posted, it's here:

http://stevezeva.homestead.com/ring.jpg

This looks interesting!

Steve


On Tue, Jul 29, 2014 at 5:56 PM, <[log in to unmask]> wrote:

> Hi steve
>
> I managed to get to a good microscope this afternoon. Everyone of these
> spots looks like someone circled it* w*ith a magic marker.
>
> Would you mind posting one more pic for me.
>
> Thanks
>
> John Foster
>
>
>

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