Well, as others have noted, it does mark. Visibility varies with angle, from what I’ve seen. Of course, I may have overcooked, undercooked, or undercoated it. Take one at sampling…well, take 2. Take one was on a medical alert bracelet that I’m starting to think might not have been stainless at all, since it left no marks at all.
Those look like pretty good markings. Permanent? 
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Could not take them off with rubbing alcohol or fingernail, so pretty persistent.
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I did a piece of steel with a logo on it, and it would take a tool to scrape (scratch) it off.
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