Here's one panel of my latest comic. This is a color scan, so it shows the non-reproducible blue pencil marks. This is my first time trying this kind of pencil, and I think I'm a convert. They never have them at our local art supply store, so when I was in Philadelphia, I bought a great big handful of them.
The idea is, that you can pencil the drawing and ink it. You don't have to erase the pencils, because if you scan it in black & white, the pencils don't show. That the idea, anyway, only next time I won't be so heavy handed with it.