So maybe I do not know what the hell I am talking about because I am a new guy - But I put my 1858 seated half (that I found a couple weeks ago) in some lemon juice overnight and it came out well. Yes the back looks just as good. But to me, this is as good as a coin can look after being buried all those years. It looks no more worn than the modern change in my pocket. It was halfway under a huge rock which was under a big old tree. Maybe that protected it. But I am proud of this one. And this post is also for anyone considering a relatively safe and effective cleaning method that will not turn your silver coin white or yellow or whatever.