Depends on which surface is an original bond and which surface is laminated
in process.

Relative opacity could just be prepreg type, processing requirements. Color
largely irrelevant.

It's a sign that their process has changed, though, so you'd best be on your
guard for more serious deviations.

RL
----- Original Message -----
From: Genny Gibbard <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, February 26, 2002 9:59 AM
Subject: [TN] The board looks funny...


> Hi,
> We just received a new rev of a PWB in house.  It has not been populated
> yet.  It looks like it has been built correctly - the right layer order,
> connections, etc - but it looks different than the rest of our 4 layer
> boards.  Normally the traces on the inner layer that is closest to the
> surface appear dark in colour and the deeper layer appears lighter.  This
> board is the opposite.  The layer closest to the surface is light in
colour
> and the deeper layer is dark.  Also, the FR4 seems much easier to see
> through than usual.
>
> Any thoughts or explanations for this?
> Thanks for your time.
>
> Genny Gibbard (mailto:[log in to unmask])
>
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