Copper patina is a natural coating that develops on the surface of copper gutters over time due to exposure to the elements. It is a chemical reaction between copper and the surrounding environment, and it typically occurs in the form of a greenish-blue or brownish-green layer.

The patina on copper gutters is actually a layer of copper carbonate, copper sulfate, and copper chloride that forms as a result of the copper reacting with oxygen, water, and other chemicals in the atmosphere. This layer of patina helps to protect the underlying copper from further corrosion and can also enhance the aesthetics of the gutters.

Some homeowners actually prefer the look of patina on their copper gutters Chicago, as it can give a distinctive, aged appearance to the home’s exterior. However, if you prefer the look of new copper, it is possible to slow down the development of patina by using protective coatings or by regularly cleaning the gutters to remove any debris that may be accelerating the patination process.