Tarnish is caused by certain foods that contain sulfides, and it is important to make sure that the silverware shouldn't be left uncleaned if comes into contact with certain items. Eggs, tomatoes, ketchup, salad dressings and mustard, in addition to some of the few stated above, could all increase the tarnish on the silverware.
Silverware should be kept from moist areas and direct sunlight, in order to prevent tarnishing. Instead, it should be kept in a dark, dry place, protected from these elements. Wrap the silverware in tissue paper, put it into sealed polyethylene bags, in order to prevent excessive air from reaching the silverware--this causes an increase in tarnishing.
The Silver Institute also recommends to avoid storing silverware directly on wood surfaces. Wood often contains acids that can in turn could damage the finish of the silverware.
Do not use abrasive cleansers or other materials to polish the silverware. A soft cloth and commercial cleaner will do the trick.
Putting silverware in a dishwasher may cause damage.
Toothpaste can be used on brass and silver polish. This gives the utensils a high shine. Follow with the appropriate polish.
Scratches add character and memories! Use of silverware will give it what is called patina. This is the beautiful soft, rich glow that is prized in old silver.