Anyways, it worked out in the end because the nickel and quarter have lightly toned up pinkish and yellow. The fields of the nickel and rim of the quarter are toned. It's a bit difficult to see without light, but it's most certainly there. Should I leave them to tone longer, or take them out, put them into something air tight to prevent further toning? Opinions please! 
Posted 12/24/2018 12:58 am
Pictures would help. If they're sealed inside plastic with cardboard, it's a good bet the sulphur in the cardboard is causing the toning, so it all depends on if you like it or not. For reference, I picked up a couple Effigy Mounds quarters in South Carolina last April, folded them in a thin piece of hotel cardboard to protect them, and this is what one looks like today compared with one stored in a tube.
