Step 11: Extras
For my mark, I used duct tape. I cut out the image in duct tape, and duct taped the blade. The metal you expose is the metal that will be etched. Then, same as above, positive end to metal, negative to q tip, and etched the design in.
Filework: You can use small files to create an intricate design into the back of your knife. I attempted a vine pattern on the back of mine. I used a round file and triangular, and filed in the vine. Then, I smoothed out the corners, to make the vine more curvy. A quick search on the internet for knife file work tutorials will yield a lot more patterns.