Copper can be colored using oxidizing agents, heat, colored pencils, paints, inks, resins, Gilders Paste and other products. Before applying any of these surface treatments, be sure the metal is clean.
The process of manufacturing this copper material leaves oils and residue that should be cleaned off. A good cleaning solution can be made from dish soap, ammonia and water.
Make about 4 cups of solution at a time. 4 cups water, a squirt of dish soap and about 2 tablespoons of ammonia. This will make a potent degreasing solution for copper. Use the toothbrush to get into detailed areas.