[Steve Davis]

DK, Generally, the panels in our cabinets are constructed with a core material that has a thin layer of wood on each side. The thin layer will have the grain running perpendicular to the core grain. This thin layer is called "cross-banding", sometimes simply referred to as "banding". The purpose of the cross-banding is to prevent splitting/cracking and warping of the core. I believe the wood you are seeing under the photo finish is this cross-banding.

Steve