You should monitor the copper closely to ensure the desired patina is achieved, and if it isn’t, you can apply additional coats of ammonia, if necessary. After cleaning, you should then apply a weak ammonia solution to the copper and leave it to sit for several hours in a well-ventilated area. Generally, a patina can be achieved within several days to several weeks, but it can take longer if you want to create a richer colour to the copper.įirst, you should clean the copper to remove any dirt or grime, as this can slow down the patina process. The amount of time it takes for copper to patina with ammonia depends on several factors, including the exposure to the atmosphere and the strength of the ammonia solution. How long does it take to patina copper with ammonia? The colors created by the process can only be achieved chemically and often stand out beautifully against other colors. A light blue-green patina is usually achieved with lighter concentrations of ammonia and cupric nitrate, while a deeper blue-green color requires stronger concentrations.Īmmonia patina is a great way to give copper a unique and eye-catching look with very little effort. The colors created by the patina process can be controlled by changing the amount and type of chemicals used. This copper salt layer creates a protective coating that helps to slow down the corrosion of the copper beneath it. This copper salt layer is what forms the blue-green patina that is seen on copper surfaces. When the ammonia and cupric nitrate are mixed, it forms a mix of ammonium nitrate and cupric hydrate, which then reacts with oxygen to form an ammonium copper salt. The colors are created by a chemical reaction between the ammonia, copper, and oxygen. It can create beautiful colors that range from a light blue-green to a deep green-blue. The process involves using a combination of ammonia and cupric nitrate. How does ammonia patina copper?Īmmonia patina is a chemical reaction process that creates a striking blue-green color on copper surfaces. If you have any excess patina you can simply remove it with a cloth and metal polish. If you want to bring out more of the blue patina color you can re-apply the patina solution multiple times.Īllow the copper to air dry after and you are done!.Īfter the pilot coat, you can also finish the blue patina with sealer or wax for a glossy finish. This will help to bring out the blue patina of the copper. Once the patina solution has had a chance to sit, rinse off the copper with clean water. Let the patina solution sit on the copper for 5 to 10 minutes. Then brush the patina solution onto the copper making sure to cover all surfaces. When ready, take the brush and dip it into the patina solution. Mix the solution together until the salt is completely dissolved. To make the patina solution you will mix together 1 cup of white vinegar with 2 tablespoons of salt and 1 cup of water. Once this is done, you can move on to the patina solution. This can be done by using a steel wool pad and lightly scrubbing the copper to remove any dirt or tarnish from the surface. You can start by preparing the copper for the patina. To put a blue patina on copper you will need the following materials: copper sheet or wire, white vinegar, salt, water, a brush, and steel wool. Naturally, this process cannot be controlled and may take some time, but the blue that is produced is usually a softer, more natural color. This means that you can simply leave the copper outside and let it be exposed to rain, wind, and sunlight. If you want the copper to be darker, reapply the paste and repeat the process.Īlternatively, you can also make copper turn blue through natural oxidation. Stir the mixture until it forms a thick paste, then spread the paste on the copper surface and let it set for several hours.Īfter this, wipe the copper’s surface with a damp cloth and inspect the results. Once you’re set up, mix together equal parts white vinegar, salt, and flour in a container. You’ll need to wear protective clothing and safety glasses and work in a well-ventilated space. The easiest way to ‘age’ copper is to use chemicals. To make copper turn blue, you could either chemically treat it or expose it to the elements.
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