SOLD. One of a Kind. The middle section of this piece is created by fuming the copper with ammonia for several hours. The reaction always varies but in this piece created some brilliant blues. The brownish copper pieces on either side are cold connected with copper rivets, creating a collage like effect. 10" x 10" x 1/4". back is baltic birch with a steel wre for easy and lightweight hanging. Free shipping in Continental US.