Copper Fold Formed Earrings. Fold forming is the process of heating (annealing) the metal then placing the disc in a vice, folding it and hammering the fold for detail. Then the disc is annealed again and unfolded. The patina is created from the flame which adds oxides called fire scale. A very fine steel wool was used to polish the metal and creates hints of shiny copper through the patina. Niobium, hypoallergenic ear wires add a nice design element.