Nice job on the colorfill Mark.
As an engraver who does a bunch of colorfill, I would encourage anyone getting their work engraved to try doing their own colorfill. My charge for colorfill on a pen is $3. Gets expensive if you're doing several. It's basically a wipe on/wipe off procedure. The colorfill material (paste consistancy acrylic paint) remains in the engraved areas and wipes right off the finished, unengraved area. The pen must be finished to avoid having to resand the pen and run the risk of sanding away a portion or all of the engraving.
Anybody want to try for themselves, send me a small brown mailer with a $.63 stamp on it and I'll send you a maple pen box lid with some sample engraving on it for you to practise colorfilling. Go to any artist supply store ( Michael's, Jo-Annes, etc.) and pick up a small tube of artists acrylic paint (probably gold or silver as I've found those are the most popular colorfill colors).