1887 Morgan With Old Glue, Paper... Acetone Soak ( 2 Days)

24 hours is OK at this point - don't forget, you're unwinding decades of "progress" with this glue - and don't forget a quick swish in "throwaway" acetone during the changeover, so nothing from the old bath stays adhered to the coin.

For the record, even with Morgan-size coins I use a shotglass for the bath. No need for anything larger; indeed, a shotglass forces a Morgan to stand sideways so it's not laying on a flat surface. A shotglass with a little pane of glass on top (sealing it near-airtight) will last overnight without evaporation.