-----Original Message-----
From: Huffman Connie Civ WRALC/MAIPL
Sent: Tuesday, January 07, 2003 12:50 PM
To: [log in to unmask]
Subject: RE: [Fwd: Re: Coupons]


Joe, thanks for your observations.  we wondered the same thing, but in all
cases there is positive etchback.  is it possible to leave a remnant of
smear on the foil edge, if enough resin has been removed top and bottom as
to create positive etchback?
what do you think about the possibility of some sort of smut left as a
result of the plasma etching process that our high pressure washer couldnt
remove?
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Tuesday, January 07, 2003 12:41 PM
To: [log in to unmask]
Subject: [Fwd: Re: Coupons]



>
> From: [log in to unmask]
> Date: 2003/01/07 Tue PM 12:37:32 EST
> To: [log in to unmask]
> Subject: Re: Coupons
>
> Hi Randy,
>
> These appear a bit different, perhaps a bit of resin smear that did not
get
> removed. You my have more than one issue at work.
>
> You may wish to do some unmounted cross sections before any plating. Dip
them
> in an immersion tin or immersion silver solution and look for any copper
> color. Silver or tin should replace any clean, exposed copper. You only
get a
> "half a hole" to look at but it is more area to inspect than you get in a
> cross section.
>
> Chasing these things to ground can be frustrating as they sometimes
dissapear
> before a cause can be found.
>
> Good luck in your efforts.
>
> Kind regards,
> Joe
>
>

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