I have no idea. BUT I have a friend that I made a few knives for in the past. I lost alot of pictures and asked him to bring his knives over so I could get new pictures of them. He left them for a few days, and while I had them I polished them back up. Boy was he mad at me....said he liked the tarnished look brass had after a few years. All I could do was tell him to wait a few years to get it back and apologize.