Why aluminum foil in boiling water cleans silverware

Tarnished silver isn’t dirty—it’s silver sulfide, formed when silver reacts with sulfur compounds in the air.

When you put silver + aluminum foil + baking soda + hot water together, you create a simple electrochemical reaction:

  • Aluminum is more reactive than silver

  • Sulfur “prefers” aluminum over silver

  • The sulfur transfers from the silver to the aluminum

  • The silver is reduced back to its shiny metallic form

In short:
👉 The tarnish moves from the silver onto the aluminum

That’s why the foil often turns dark while the silver brightens.

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