Brian, Take some scrap steel, polish and put a slice of apple on it for an hour at a time. I am not kidding. As well, any hydorchloric acid will do it, ie: toilet cleaner, concrete etchant, ect. Dupont makes a steel refinishing system (part # 5718-s) that I have played around with on a (Junk, been a house fire) Superposed action, you need to dip in this and I don't know if you could do just a spot like you described, with this stuff the longer you leave it the darker the gray will get. Experiment till you get the steel to turn the color you want. If you did decide to do the whole action I can give you some more of my experience from what I have done so far. Regards, John H
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