Sterling silver chains need to properly cleaned to maintain their lustre. Sterling silver naturally tarnishes over time as the silver and the sulphides from humidity and air pollution interact. This tarnish begins as a slightly golden opaque covering, but if left untreated it eventually turns the chain black.
Place aluminium foil on the bottom of a glass pan shiny side up.
Boil water. While water is boiling place your sterling silver chain on the aluminium foil. Sprinkle a generous amount of baking soda on top of your chain.
Pour boiling water on top of your sterling silver chain. Make sure you cover the chain completely with boiling water. Allow the chain to soak for three minutes.
Take your tongs and flip the chain over. Make sure the opposite side of your chain is touching the aluminium foil. Leave it in for two minutes.
Remove it from the water and dry the chain with cotton cloth.
Remove sterling silver prior to showering. Keep sterling silver from tarnishing by keeping it in a zip lock bag with a soft cotton cloth. In a pinch it can be cleaned with a silver dip. You can clean more then one chain at time with this method.
Do not put sterling silver jewellery in chlorine.