Dish, salt and vinegar deter deter
In a container mix water, salt, a tablespoon of white vinegar and a few drops of liquid detergent for the dishes.

Soak the silver objects in the solution and wait about 20 minutes. Finally, rinse with plenty of water and pass a clean cloth to spot and dry the silver.

Sodium bicarbonate
Mix bicarbonate and water until it gets a solution with a creamy consistency, to be used to clean the silver until completely eliminate the dark spots.

Rinse with plenty of water and dry with a clean cloth.

To prevent blackened silver from making it in contact with liquids such as ammonia, bleach or other chemicals. If possible, store the silver objects in the aluminum paper and clean them always before and after use.