Perfect for items that require affordable long term storage solutions for any product that may tarnish. Our newest corrosion bag works with 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. Corrosion bags are a revolutionary technological advance that bonds solid state reactive materials (bonded copper particles) into a polymer matrix. This matrix then reacts with and neutralizes all corrosive gases that pass through or come in contact with the film. These active corrosion sites have created a torturous path for corrosive gases trying to migrate through the plastic.