I don't exactly know what they are, but is it normal to have dark lines on your blade. (They are located on the top and bottom of the hole.) Is there a way to get those lines out? What are they?
P.S. Sorry about the finger shadows on the blade.
I've got the same discoloration on the VG-10 of my Superhawk and in the same place. It doesn't bother me enough to try to figure out how to get it out.
Vg10 is an ingot steel you can actually see the grain of the steel sometimes I also have this on my Vg10 knives as well try some steel wool if you think it's a problem our maybe some metal polish