For the modern coins that we find while metal detecting, a simple rock tumbler will ... But, with all of this power comes the risk of ruining a good coin.
from Google Alert - metal detecting great finds https://www.google.com/url?rct=j&sa=t&url=http://pinbahis185.com/detecting-cleaned-coins&ct=ga&cd=CAIyHGQxYTc0ZWJmMDQxMjk0NzA6Y29tOmVuOlVTOkw&usg=AFQjCNFqYgR6uYWo-BWYMuxXmVzwzwQJGg
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