What is causing your silverplated silverware to tarnish when you put it in the dishwasher?

Tarnishing of silver-plated silverware in a dishwasher is primarily due to chemical reactions induced by the dishwasher detergent. Dishwasher detergents often contain various substances, such as chlorides and phosphates, that can interact with the silver plating. These substances can cause the silver to react with oxygen and sulfur present in the water and air, leading to the formation of silver sulfide and silver chloride compounds. These compounds appear as a dark, tarnished layer on the silverware.

Additionally, the high temperature and moisture inside a dishwasher can accelerate the tarnishing process. The heat and steam can facilitate the chemical reactions between the silver plating and the detergent components, resulting in faster tarnishing.

To prevent tarnishing of silver-plated silverware in the dishwasher, it is recommended to use a mild, non-abrasive detergent that is specifically formulated for silver. Additionally, you can place the silverware in a separate compartment of the dishwasher or use a protective silverware basket to minimize direct contact with the detergent and water. It's also important to avoid using harsh abrasives or acidic cleaners, as these can damage the silver plating.