I just took the homemade bridgeplate out of the bath. I’m using 1/8″ thick copper on this guitar, and I’ve given it the same treatment I gave to the pickguard on Driftwood 1. Once I fabricate the part I clean it off thoroughly and cover it with a salt solution. I place the part in a bowl filled with household ammonia and cover the whole thing with plastic. I leave the bowl out in the sun for a couple of hours and the copper develops a great patina not unlike what you might find on the copper sheeting hammered on to pilings at a pier.