its basically a miniature carbon arc as the graphite conduct the power. its time consuming but you can get amazing detail. i saw it being done years back with a blade and the guy etched medieval type scrips on it.
unsure if it will work on stainless though. 17amp hour bike battery, a couple of crock clips, a bit of wire and a pencil. worth a crack on a piece of waste steel though before you try a blade
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