Use in well ventilated area, preferably outdoors.īefore starting this project, see Homemade Patina Precautions for safety guidelines. Patinas made with ordinary household products may be harmful if ingested, inhaled, or worn against the skin. So get ready for a fun experience in creating a rustic finish for your cuff bracelet (or other metal project)! There are so many factors that can affect the color, pattern, and intensity of your patina that it would be difficult to get the exact same result twice. This one unexpectedly turned out looking like a landscape painting with a tree over at the left side: One of the fun things about working with patinas like this one is that the result is usually a surprise! This can be done using various chemicals and substances such as muriatic acid, apple cider vinegar, or mustard and it can also be done by sticking the blade into any acidic vegetable or fruit such as an orange or an apple.Rustic copper patina finish by Rena Klingenberg Knife collectors that own carbon steel blades, sometimes force a patina onto the blade to help protect it and give it a more personalized look. Steaming foods or using soap on a wok or other dishware could damage the patina and possibly allow rust. The patina on a wok is a dark coating of oils that have been burned onto it to prevent food sticking and to enhance the flavor of the foods cooked in it. Patinas can also be found in woks or other metal baking dishes, which form when properly seasoned. This type of patina is formed by the corrosion caused by the elements the air might hold, residue from the wear of the carbon brush and moisture thus, the patina needs special conditions to work as intended. Patina is also found on slip rings and commutators. More simply the French sculptor Auguste Rodin used to instruct assistants at his studio to urinate over bronzes stored in the outside yard to get the final effect he wanted, but there is no more real need to do that in modern times.Ī patina can be produced on copper by the application of vinegar (acetic acid) and this patina will be water-soluble and will not last on the outside of a building like a “true” patina, that’s why It is usually used as pigment. Sometimes the surface is enhanced by waxing, oiling, or other types of lacquers or clear-coats. Some patina colours are achieved by the mixing of colors from the reaction with the metal surface with pigments added to the chemicals. The basic palette for patinas on copper alloys includes chemicals like ammonium sulfide (blue-black), liver of sulfur (brown-black), cupric nitrate (blue-green) and ferric nitrate (yellow-brown).įor artworks, patination is often deliberately accelerated by applying chemicals with heat.Ĭolors range from matte sandstone yellow to deep blues, greens, whites, reds and various blacks. Patination composition varies with the reacted elements and these will determine the color of the patina: for copper alloys, such as bronze, exposure to chlorides leads to green, while sulfur compounds (such as “liver of sulfur”) tend to brown. They are often used by artists as surface embellishments either for color, texture, or both. This is the technical answer, while on the art’s point of view, the patina is what makes a sculpture a unique piece of artĪrtists and metalworkers often deliberately add patinas as a part of the original design and decoration of art and furniture, or to simulate antiquity in newly made objects a process that is often called “distressing”.Ī wide range of chemicals, both household and commercial, can give a variety of patinas. On metal, patina is a coating of various chemical compounds such as oxides, carbonates, sulfides, or sulfates formed on the surface during exposure to atmospheric elements. #Patina is a thin layer that variously forms on the surface of copper, bronze and similar metals. For those who are new to this business it may be worth starting to answer a simple question: what do we mean by Patina?
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