How to clean tarnished copper using a simple bottle of ketchup kept on your kitchen shelf? Experts explain the science behind preventing oxidation for good

Copper tarnish results from a natural chemical reaction with its environment. The acid found in ordinary tomato ketchup effectively removes this tarnish. Always test a small, hidden spot before cleaning your copper items. After applying and gently polishing, rinse and dry the copper thoroughly. Sealing with oil or wax helps to slow down future tarnishing.