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Below are images showing opposite sides of a silverplated luncheon knife exposed to the open air for 14 months. The top image is the knife as it sat on a buffet, face up. The bottom image is of the side that was facing down and, therefore, not directly exposed to harmful tarnish-producing particulate. This is a clear illustration that silver will maintain its finish over a longer period when kept in a case or enclosed cabinet. (There should be no off-gassing from the case or cabinet. If it is made of wood, the interior surface should be sealed, preferably with lacquer or water-based polyurethane. If latex paint is used, allow it to dry for at least four months.)