Ansonia alloy C21000 is a 5% Zn alloy. It is red in color and the least expensive copper alloy to be used as gilding, an imitation gold leaf. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: CU-770. Producer or source: Ansonia Copper & Brass Inc.