Working with metals

I'm taking a bit of a break from shawl pins and working on some jewelry.  I've been experimenting with copper and looking at different patina options.  Of course, the best patina I've seen is some that occurred naturally on some old copper flashing.  I just wish I had more of it.  In the necklace below, the disk beads are faux turquoise made of polymer clay and the patina on the copper panel is all natural.  I sealed it with Renaissance Wax.