Perfect for smaller items that require affordable long term storage solutions for any product that may tarnish. These bags now contain a translucent film on both sides of the bag to allow thorough viewing of your item inside. Protects items from tarnish for up to 3 years. EFFECTIVENESS INDICATOR These bags feature a translucent copper colored that will turn black indicating it is time to change the bag. WORKS ON ALL METALS This Anti-Tarnish Bag provides tarnish prevention capabilities for non-ferrous metals like silver, gold, brass, copper and bronze, as well as ferrous metals. NO CHEMICALS NEEDED Each bag is non-toxic, non-abrasive, resistant to humidity and temperature changes and will NOT release corrosive gases like other charcoal-based tarnish prevention products.