Copper reacts slowly with oxygen in the aira process called oxidation.

The process produces copper oxide, a brown or black compound, or tarnish.

Eventually, other chemicals from the atmosphere, like sulfur, will turn the tarnish blue or green.

If you love a brighter shine, clean the pieces every three months.

Cleaning frequency also depends on whether the copper is lacquered or natural.

Shiny, glossy copper that does not change color or darken over time likely has a protective finish.

If the copper tarnishes quickly, the surface is untreated, or the existing lacquer has worn away.

Lemon and salt together make one of the best copper cleaners out there.

This will remove dust and any greasy film on the surface.

If the paste is too runny, add more salt.

Step 3: Scrub the Copper

Use a sponge to spread the paste over the copper.

Working in small circles, gently scrub the surface.

Mix more paste if needed.

Use a lint-free towel to dry the copper piece.

Vinegar contains acetic acid, while ketchup contains vinegar and citric acid from tomatoes.

Both acids react with the copper tarnish and breaks its bond with the copper.

Start by washing the copper item with warm, soapy water to remove dust and grime.

This should always be the first step when cleaning copper pieces.

you’ve got the option to substitute baking soda for the saltbe aware that fizzing will occur.

Or, squirt some ketchup directly onto the copper.

Either option will work to clean the copper.

That should help reduce the amount of elbow grease you better put into scrubbing it.

Step 4: Scrub the Copper

Scrub in small circles with a sponge to remove the tarnish.

Rinse away the paste or ketchup with warm water.

Removing Tarnish From Copper

Sometimes, copper can become badly tarnished.

Be sure the copper has no parts glued on before you try this method.

If the copper is glued, the heat may damage the bonds.

Add 1 to 3 tablespoons of salt.

Step 3: Submerge the copper piece

Place the copper item in the stainless steel pot.

Ensure the item is completely covered by the cleaning solution.

Step 4: Heat to a boil

Bring the solution to a boil.

Remove it from the pot.

Apply and scrub the copper with a sponge.

Try these tips to protect your copper items from damage and oxidation.

Educ.2020; 97 (8): 22442248. https://doi.org/10.1021/acs.jchemed.0c00417