So one of the parts of the engraving process is getting the outline of what it is you're engraving, for borders. I do this by taking an oil lamp and holding the piece over the dirty smoke end of the flame. It deposits smoke on the piece which I then will apply a piece of clear tape to, paste to a piece of paper, and scan into my computer which gives me my "smoke print".
You can do smoke prints after you're done. This is what I did here, for giggles, because it's a nice physical copy of what I carved into steel. I smoke printed the finished engraving, lifted the smoke with packing tape, pasted it to printer paper and scanned the result.
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