Hello Ginny:

I would suggest that the layer in question is not coated with oxide.
The next layer down (assuming it's a plane) did receive an oxide coat.

Charlie McMahon


Genny Gibbard wrote:

>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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