Soak it in cold peroxide for a couple hours. Then dip it in baking soda while still wet and rub it between your thumb and fingers. Rinse and repeat as necessary.
I'd take just one readable date or not
Spoiled east coasters
I have an uncanny ability to dig run of the mill coppers like KGII’s, braided hair etc in great shape, but all the hard to find coppers come up looking like pooo, identifiable but uglyNot all of us BolognaI love all my coppers. I have a few DBs and Matrons that look like they were minted yesterday and on the other end of the scale an even bigger pile of unidentifiable ones. But they all have personality. That's why I like digging them in any condition.
I have an uncanny ability to dig run of the mill coppers like KGII’s, braided hair etc in great shape, but all the hard to find coppers come up looking like pooo, identifiable but ugly