When I first get the copper I start with scotchbrite and 25% nitric acid. I use down to the 00 steel wool equivalent scotchbrite. From there I use rottenstone and acid, then green rouge, and red on a ROS or wheel depending on my mood. After this I use Rottenstone then red rouge and buffs. Then a final wipe with the acid to prep for plating. After plating a buff then over the iodine.