The "plating" lines are mirrored on the bump channel with out the colors. I built the bump map with a 1 pixel black line (same as the texture map) bracketed by 1 pixel wide lines of medium gray to set it off a bit from the texture map. Here is a close up that I made to try and show the bump map. In this type of lighting, however, it doesn't show up very well. It looks better with light coming in from 2 or at most 2 directions. mike