![]() ![]() Copper is a reddish-orange metal, and the color will not change when exposed to ammonia. In many cases, blue patina can be used to determine the age of an object, as the blues and greens of the patina become more defined. The blue color of the patina can range from a turquoise green to a deep navy blue, depending on the metal and the elements it is exposed to.īlue patina will steadily form over time, becoming darker in hue and texture the longer it is exposed to elements. It is most commonly formed when metal objects are exposed to sea salt, salty dust, and humidity, creating a unique and distinctive look that cannot be replicated. It is mainly seen on metals like copper, brass, and bronze, but can also appear on some steels. It forms a thin layer of molecules over the metal surface, which changes the color to a deep, often very beautiful, blue.īlue patina is regularly used in architectural decoration and jewelry, as well as being a popular collector’s item. What is blue patina?īlue patina is a type of corrosion that occurs naturally on certain metals when exposed to elements like water and oxygen. ![]() To maintain the blue patina, it’s important to regularly wax the copper surface to protect it from further oxidation. The rate at which the blue color develops depends on the environmental conditions the copper is exposed to for example, the color will appear more quickly in coastal areas than in drier, inland locations. ![]() This process is often desired in antique copper jewelry and pots, as the blue patina gives them an attractive, vintage appearance. Over time, these compounds impart a characteristic blue color to copper surfaces, making the metal look “aged”. Copper oxide is a pale, blue powder, while copper carbonate is a light, blue-green substance. Oxidation occurs when copper is exposed to oxygen or water, producing copper oxide and copper carbonate. What metal turns blue with age?Ĭopper is a metal that turns blue with age due to oxidation. The color will generally deepen over time, becoming darker and eventually turning black. This thin film is formed by chemical reactions between the copper in the brass and the oxygen in the air. The blue-green color of brass over time is caused by a thin layer of copper oxide forming on the surface of the metal. This is especially true for brass items that have been exposed to high levels of oxygen, moisture, and chemicals. Yes, brass can go blue over time due to natural oxidation, the same process that causes iron to rust. Chemical compounds include special lubricants, waxes, oils, or mixtures of bluing agents, all of which require proper application and cleaning to prevent rusting or discoloration.Īll of these methods result in a stable blue finish that is often more durable than the original brass surface. How to see who liked your comment but not following on Instagram?Ĭold tanks use cold chemicals, often hydrogen peroxide or nitric acid, and are used to create subtle blue/black tones. ![]()
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