The panel in a 5 piece door can be either a plywood veneer or it can be solid wood. Because solid wood is thicker, the perimeter of the panel has to be beveled so it will fit in the groove (or rabbet) of the frame. That bevel can either be on the front of the door (raised panel) or the bevel can be on the back side of the door (reverse raised panel) as seen in my cabinet doors
The solid wood panels in my doors have not swollen or shrunk at all in the 6+ years I’ve had them.
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Color of frames
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