I did a lot of hunting on a visit, mostly cruddy pennies, but had one really green and crusty coin that I later found to be an IH, my first I got anxious to see the date and make it clean so I went to hydrogen peroxide, and made some progress, but not much, except the date came through, 1898. I read where a mineral oil soak might be good,,,didn't have mineral oil so I used vegetable oil instead. MISTAKE. Now the detail is gone and it is black. Oh well, it wasn't a real treasure since I see y'all here getting IHs a lot. Live and learn. martin