u/Kristapithicus

I’ve been going through some family stuff and I found a few copper plates related to my great-great-grandfather. One of them is in pretty good shape, but the other one is showing some corrosion or oxidation damage and I was wondering if there is a good way to deal with this. Some quick googling showed some recommendations like soaking in vinegar or using Brasso, but I wanted to get the communities opinion on the best approach to mitigating the damage and how best to store them. Thank you!