For the modern coins that we find while metal detecting, a simple rock tumbler ... You must take great care when cleaning gold, silver and other precious ...
from Google Alert - metal detecting great finds https://www.google.com/url?rct=j&sa=t&url=http://haiwaimanhua.com/detecting-cleaned-coins&ct=ga&cd=CAIyHGQxYTc0ZWJmMDQxMjk0NzA6Y29tOmVuOlVTOkw&usg=AFQjCNGibUr7P22vRWoTDSRKqB2DXx_V3A
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