What Does It Mean To ‘Pickle’ Copper?

When copper has been exposed to the elements, its surface will develop a layer of copper oxide. This can make the object appear dirty and is just plain unattractive, so many people look for ways to remove the layer of oxide. There are a number of chemicals that can be used to treat affected copper; the term ‘pickle’ is one used by metalworkers to describe the solution that is used to remove the oxide.

Step 1: In a plastic bucket, mix together about half a kilo of sodium bisulfate with about 4 litres of water. Together, this creates sulfuric acid and is what you will use to ‘pickle’ your copper. Make sure that you’re wearing safety glasses and chemical-resistant gloves to protect your skin.

Step 2: Take a piece of copper wire that you have twisted into a handle and hook it onto the object that you wish to ‘pickle’. Dunk the object into the solution and leave to soak for between 5 and 10 minutes, or until you feel that the metal has bee cleaned.

Step 3: Using the handle you made, remove the copper from the solution and give it a good rinse to remove any remaining acid. You can then hang the object up by the handle in a well-sunned area so that it can dry.

If you cannot get your hands on any sodium bisulfate, you should be able to find it at any swimming pool supply store. When working with this harmful chemical (especially when in its liquid sulfuric acid form) you should ensure that you are wearing protective clothing and that you are in a well-ventilated area to avoid breathing in the harmful vapours.