Kusama Black Bronze EarringKusama Bronze earrings with black patina; 1. 25 inches. Julie is inspired by the metal relief work prevalent in Mid Century jewelry design. This particular dot pattern is also the hallmark of artist Yayoi Kusama. Julie Cohn Design uses a special finish on their bronze pieces, which protects them from tarnishing and discoloring your skin. They recommend using a clean cloth to restore luster on the pieces. Do not use any chemical or polishing solutions