Hey everyone. I found an 1893 O barber half and it’s in rough shape. Heavily worn but also covered in some black crust. I’ve heard all about electrolysis helping removing black crust off silver coins but I’m not set up for electrolysis at this time. Any other suggestions to test? Does boiling water with aluminum foil actually work? A lady told me to put try hand sanitizer on it - never heard of that before. But I wonder if it would remove the black crust without damaging the silver... Any suggestions will be greatly appreciated. Thanks!