Sterling silver is an alloy that contains metals which react with chemicals in the air and produce tarnish. Exposure to high moisture levels, sunlight, and contaminants such as salt water can increase this reaction. To protect sterling silver, keep it in airtight packaging, use tarnish-resistant products (like tarnish tabs or strips) that absorb harmful chemicals, and store it in a cool, dry place. Most tarnish can be easily removed by polishing with a mild abrasive or by soaking the silver in an anti-tarnish solution.