
Go to Google and find a bunch of stuff on patina. Wet the mod/atty in ammonia, roll it in coarse salt, I used kowher, suspend it in a closed container with some ammonia for a couple of hours. I did this to the mod/atty attached. Also liver of sulfur will almost immediately turn copper black then rub some off on the high points.
Also look in the modding forum for more stuff, but the best place is Google cause the crafters patina a lot of stuff and there are videos.