I used to do the hot peroxide bath on my dug Large Cents and IH's. Next I would soak in olive oil. I determined I was ruining my coins with this method. Coppers would darken so that detail became non-existant.
Olive oil is an organic compound, and acidic. Unless the oil is neutralized in some way, the copper will develop pitting over time.
A better choice would be mineral oil.
When I listen to LED ZEPPELIN...so do my neighbors...
Roll hunting since '77
Dirt fishing since '72
Edited by fistfulladirt
08/24/2014 7:43 pm