What leads to the formation of patina in copper?
Almost all metals on this earth are considered a solid and stable material. But even after that, the powerful environment also affects these metals. Prolonged exposure to air can cause an iron oxide process. Likewise, copper is also sensitive to such alterations and, for this reason, develops a green patina.
What is copper?
Copper is a reddish-brown chemical element closely related to gold and silver. Copper is a malleable metal and, therefore, is used to make coins, utensils, etc. It is also very conductive by nature and also conducts heat and energy. It is also one of the oldest metals discovered and used by the human race.
What is the reason why copper turns green?
It is through the process of oxidation of copper that it turns green. When exposed to air and water, it leads to the formation of a thin green layer on the surface of the metal. This green substance is known as copper carbonate. But unlike iron, which weakens due to oxidation, the green patina does not affect the quality of the metal. In fact, some people say that the green substance protects the surface of the metal. Oxidation is a slow and slow process and before turning green, copper can turn dark brown and black. The green material is also called patina.
What is the patina for?
This may seem unnecessary, but the patina also has uses. In recent years, Greek artists have used this green patina in their works. It was called “cardenillo” which means “greek green”. It was considered to be the brightest green pigment available, but due to its low durability, it was abandoned by artists at the end of the 19th century. Another use of this patina was dating objects. It was popular in the antiques trade where it was supposed to preserve the integrity of the object. The patina is also used in certain functions of electrical engineering.
Common Patina Examples
One of the most famous examples of copper patina is the famous Statue of Liberty. Few people know that this world famous monument is made of copper. It is known for its light green color that is only patina. This happened when the copper material of which the statue is made reacted with water and air and oxidized for several years. Old pans and firearms also develop a patina on their surface as they age. For some people, this increases the character and value of the product. The best part is that it can be easily cleaned with little effort.
How to get rid of patina?
Keeping copper utensils in direct sunlight will help prevent the formation of green patina. It is the oxygen that leads to the formation of the green layer and, therefore, preventing oxygen from coming into contact with the metal will stop the patina formation. An excellent way to get rid of patina is to use a solution of salt and vinegar. Once the patina has been cleaned, the surface of the article must be cleaned to avoid traces of water.