What causes silver utensils to tarnish and how to prevent that?
Silver tarnish occurs because of exposure of the silver to trace amounts of sulfur in the environment, mainly in the form of hydrogen sulfide gas, but also from rubber.
The best way to prevent silverware tarnish is to store the silverware in a container which (a) limits their exposure to air, and (b) retards tarnish. The simplest of these is sliver cloth, a heavy cloth which has been treated with chemicals which absorb sulfur. We have an entire drawer of sliver under silvercloth, and I don't think I've polished it since we bought it.