Over time, silver loses its luster and becomes darkened with a dull film. This film is silver sulfide and is the result of the silver's reacting chemically to the air around it. This chemical process is easily reversed with a few items often found in the home. Anytime the silver becomes tarnished, you can safely use this process to quickly restore the silver to its original condition and return the shine.
Cover the bottom of the baking dish or pan with aluminum foil with the shiny side of the foil facing up. Lay the buckle on top of the foil.
Boil water in a pot. Remove the pot from the heat and place it in the sink. Use a cup of baking soda for every gallon of water.
Pour the water and baking soda over the silver and aluminum foil in the pan. The water should cover the silver buckle.
Wait for the tarnish to dissolve. This may take a few minutes. Severely tarnished silver may require repeated treatments.