ArtBin® Tarnish Inhibitor products are made with a special additive EXCLUSIVE to ArtBin®. This additive has been molded directly into the dividers contained in these products. The Inhibiting additive in the dividers forms a protective layer around metal surfaces that prevents tarnishing for 5 years! ArtBin s Tarnish Inhibitor is the answer for safely storing and preserving non-ferrous metals including silver, gold, brass and copper jewelry, beads and components.