Darkening copper is a strategy of altering the floor of copper to provide it a darker, extra aged look. This may be carried out for aesthetic causes, to create a particular look or to guard the copper from corrosion. There are a selection of various strategies for darkening copper, every with its personal benefits and drawbacks.
One frequent methodology is to make use of a chemical answer to oxidize the floor of the copper. This may be carried out with quite a lot of chemical substances, together with liver of sulfur, potassium sulfide, and ammonium sulfide. The chemical response between the copper and the sulfur creates a darkish patina on the floor of the steel.