Corrosion Intercept is used for the storage and preservation of Copper, Nickel, Silver and Gold Coins, Medallions, Bars and Medals. It utilizes the State of the Art" technology in the prevention of the corrosion of rare coins and artifacts. There are no volatile oils or additives in the Corrosion Intercept so it will not contaminate the item it is used to protect. The Intercept lining of this album reacts with and neutralizes gases in the air which causes coins to spot, discolor and tarnish. Coins stored in this album will remain in the current state of preservation. Intercept will not remove existing tarnish.