The Dansco Archival Quality Slipcases are produced with Silver-Guard Corrosion-Inhibiting protection. No other product on the market matches Silver-Guard Corrosion-Inhabiting protection. This Military Specification material permanently neutralizes corrosive gasses in the air that can cause toning and discoloration. This works with silver, gold copper, and nickel coins and metals, medallions, bars, and ferrous metals. Dansco Coin Albums have always been made with the best archival materials and with the addition of the finely crafted slipcase the protection is invaluable. This will not remove existing toning. Always handle your coins properly. It is best to store your coins in a cool, dry place away from extreme temperature or humidity changes. With the air flow at a minimum, Dansco's Archival Quality Slipcase will offer Maximized Protection for Your Coin Collection.