There’s something other than jewelry you should keep in your jewelry box....

If you’ve got silver jewelry – keep some chalk in your jewelry box...  

Silver tarnishes a lot faster in humid weather and regular old blackboard chalk will absorb the moisture and sulfur-based air impurities that make it dull and dirty. 

The chalk trick works well with other silver and silver plated items too. Musicians often keep chalk in the case with their instruments and a stick or two in with your silverware or silver pieces can save you some polishing.