A tip I got on here C.T. (don't remember who) for brown to red/brown copper that works well for me is just a single desk lamp with an incandescent bulb. You might give that a try. The pics of the silver coins are looking good. :thumb:
Here are my experiment with coppers. I chose these two because of the difference in their coloring in hand. Same lighting setup with one lamp but with the lamp set up higher. Coins came out looking about as they would have if in hand. This has been a wonderful experince in learning something new.
They look nice. There are some real experienced photographers over at the forum in my signature. You might want to ask them if you start doing some advanced stuff, especially toned items.