Hell I see a ton of different conditions in my own small area here. I guess my point is that there’s not going to be one right or wrong answer to these cleaning/preservation questions. HP is the only thing I’ve ever found that will slowly remove that very hard crust. I live in midcoast Maine and some of my coppers come out with a thick “coast crust”. All of these variables play a huge role in cleaning and preservation. Some have a nice green color and some are more chocolate. I’m always amazed to see how coppers come out of different areas. Our soil conditions vary so much from one region to the next. The problem with the questions is that there’s just too many variables. Hey Huntsman, just out of curiosity did you use heated peroxide or cold? The only time I’ve ruined coppers with hp is when I used to use it heated up. All that being said I have a long way to go on coin conservation! haha. It will kind of seal it up and stabilize it from what I understand. Also as a final treatment you can put Renaissance wax on a coin. I'd say just don't get too aggressive trying to get all dirt off if it looks like the details will come with it. Good luck! In your case it looks like those coins still have a lot of detail so that is working in your favor. I wish there was one surefire method to get a coin back to it's former glory. I'm sure you are aware but most of these methods are irreversible. When you scrape the dirt off you are left with less detail. It's super frustrating when you have a coin that has detail but has a caked layer of dirt on it. I am going to go with peroxide and tooth pick for the time being. It's pretty amazing even after the peroxide cools down the coin will bubble for days (which is the peroxide working on the dirt) I've also seen large coppers tumbled and details that could barely be seen become a little more pronounced. I recently tried the microwaved peroxide method: It seemed to help on a coin that was probably going to flake and lose all detail. The line between dirt, patina and coin is pretty thin sometimes. I've used a stiff brush and a toothpick: sometimes it can improve the coin, other times it completely destroys the detail that is left. I think you need to do it for months to really get results. I've soaked coins in olive oil: I can't say I've seen too much change. I'm still in the experimental stage as I don't find these coins very frequently and they are almost always pretty beat up.
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