Patina color for sculpture

Patina sculpture can be seen everywhere in decoration

The cast copper sculpture is one of the best decorations for interior or outside space. Casting sculpture decorations are a language that is familiar to humans. And a skill that has been with us since ancient times. They can be hung in the hall to increase the beauty of the space. Can also be placed on the wall to enrich the expressive force of the wall. Be placed in the most obvious position in your garden. Put inconspicuous corner again. In short, casting copper sculpture can be placed everywhere.

Why patina surface for copper sculpture?

The most important valuable technique of copper patina sculpture in the interior or outside space is to harmonize with the interior architectural space form. In other words, the put sculpture key point is to find the space that needs to be decorated most and determine its position in the interior. Outdoor put sculpture according to the space to determine the correct scale and body sense of quantity. The color of the copper sculpture is particularly important. And necessary to find the best tone in harmony with the indoor and outdoor. The best fine bronze metalwork sculpture of art after processing molding. Usually, it is necessary to choose a fine suitable patina color for the design requirements of the artist. In this way, not only can improve the aesthetic effect of the sculpture artwork, but also play a role in protecting the surface of fine sculpture. For this reason, the post-processing surface technology of patina sculpture is divided into coloring technology and surface texture technology.  Coloring to ensure beauty, texture processing to ensure a long and durability. In this article, we will focus on the patina surface for sculpture.


Patina surface for copper sculpture

The patina surface for sculpture or copper thermal coloring, also known as patina color, modeled after an antique. That is to use chemical, electrolytic, physical, mechanical, and heat treatment methods. A film, coating, or coating that produces a variety of colors for the sculpture surface. Patina’s method is more, the appellation also different. Often depending on the means of treatment and color source for bronze sculpture. Generally can be divided into coating (including spraying) thermal coloring, chemical coloring, electrolysis coloring, electroless plating, and electroplating coloring, vacuum coloring, vacuum plating gold, gold coloring technology. Among, the most commonly used are chemical coloring, dyeing, heat treatment coloring for bronze sculpture. The traditional coloring methods are many, especially in copper and copper alloy artworks that are more widely used.

cowboy statue

1>Pre-patina treatment for copper and copper alloy castings

In order to ensure that the sculpture surface of metal artworks can form a uniform color, good combination, strong corrosion-resistance coloring layer. Before that, the surface of the sculpture must be pretreated with oil removal, erosion and rust removal, polishing, and so on. There are a variety of oil removal methods, which generally can be selected according to the appropriate conditions and the size of the work.

1-1>Wipe and remove oil: use a brush or cloth dipped in detergent, washing powder, lime slurry, magnesium oxide, and other degreasing substances to wipe the oil on the surface of the work. It is mainly used for the deoiling of works of art with large volume, complex shape, and difficult to be processed by other methods.

1-2>Drum oil removal: put the work into the drum of the polishing machine, add appropriate abrasive and oil removal. Suitable for large batch, small size, not easy to deform art casting oil removal.

1-3>Ultrasonic oil removal: it can remove the oil in the fine hole and the hole, and the metal corrosion on the surface of the work is small. Suitable for oil removal of small art castings.

1-4>Sulfuric acid method: Sulfuric acid can remove the oxide and rust on the surface of the work.

1-5> Etching or pickling process(Chemical coloring is the most common sculpture surface decoration method for copper sculpture and copper alloy).

1-5-1> Sulfuric acid method for sculpture surface: Sulfuric acid can remove the oxide scale and rust on the surface of the work.

Firstly, pour water into a large hard glass container. Secondly, sulfuric acid slowly into the water (equivalent to the amount of water). Dissolve the sulfuric acid solution to remove the oxide scale. It must be washed with clean water. The etching time is about 30 seconds. If the production of gold, silver, and other different sculpture artworks, need to prepare different acid. If the same acid solution is used for a long time, the concentration of the liquid will decrease. So the solution must be remodeled frequently. Copper etching can be used to brush the work with a metal brush. Wash dilute sulfuric acid with clean water and dry it.

1-5-2:Preparation of nitric acid solution: the same steps as the production of sulfuric acid solution.

Our handlers can not be rapidly poured and do not let the water directly touch the sulfuric acid. Because sulfuric acid spatters easily cause scalds or spray on the clothes will burn holes in the solution for handlers. It can burn the skin. So, handlers hand sure to use rubber gloves to protect themselves and handle with extra care and can not touch the liquid.

generally used patina sculpture coloring formula

2> Cold or thermal colored for copper sculpture and copper alloy castings

The cold coloring reaction is slow, the film generated is stronger. Thermal coloring reaction is fast, and the film is thicker, but not strong. So Aongking used to dilute the concentration of the coloring liquid to make the color layer strong and durable.

2-1> Cast patina sculpture chemical coloring process (one of the cold coloring methods of copper sculpture):

Aongking worker first uses sandpaper to rub the surface of the sculpture artwork. They are pickled with dilute sulfuric acid. Scrub it with a metal brush. Then wash the dilute sulfuric acid with clean water. The relief is then air-dried (scrubbed with sodium sulfide (crystals) several times. Make the copper skin black, and then naturally dry. Make the effect simple and dignified. Then use the metal cleaning ball to scrub the high point of the work. So as to polish it to enhance the sense of layers of the work, and then waxing anti-corrosion or spraying transparent paint and other post-processing

warm red color for a bull sculpture
warm red color for a bull sculpture

2-2> Cast patina sculpture chemical coloring process (the thermal coloring methods of copper sculpture):

2-2-1> Patina sculpture different coloring formula.

We are well known. The patina color sculpture is the color formed by the metal compound reaction itself. A fine sculpture surface has already formed as a stable metal compound. Copper sculpture thermal coloring is generally a potassium permanganate coloring formula. Potassium permanganate at high temperature produces reddish-brown manganese dioxide. Aongking has many kinds of potassium permanganate coloring formulas. (Maple (light brown) , belowChestnut (dark brown) ,Sandqreen (antiqued beige/green) ,Verdigris (natural bright greenish-blue),French Brown (two-tone light and dark brown),Anthracite (very dark almost black) ,Italian Green (dark green) )

Not all formulas are suitable for all situations. For example, a very nice warm red color for a sculpture. Generally potassium permanganate, copper sulfate composition of coloring formula. This formula is only suitable for the thermal coloring of copper sculpture with more than 70 percent “CU” content. But in the application of copper alloy sculpture is not ideal. We need a fine warm red color for the copper alloy sculpture. Aongking’s worker must be dezincification of copper alloy sculpture and added some chlorate before it can be thermal coloring. Although we can get a very beautiful fuchsia color. But, cuprous chloride is easy to oxidize and decompose and change the hue. Although the copper carving coloring liquid formula is diverse. But each color formula also has its own unique usage scenarios. The principle of coloring is basically the same. While promoting the formation of copper oxide, Aongking also to the high stability of copper oxide during the past 30 years. So the color scheme is stable.

2-2-2> Patina sculpture coloring and broil.

The copper sculpture thermal coloring process is different from physical spraying coloring, coloring after the color. Looks like from the inside of the copper sculpture, rich, natural, thick, firm, in order to achieve the color uniform and natural, this process has very strict requirements on the temperature.

Bronze sculpture’s high-temperature coloring technology has brought a great revolution to the field of copper sculpture. Bronze thermal coloring process, different from physical spray coloring. The finished color of the sculpture looks like it’s coming through the inside of the bronze sculpture. Rich, natural, massiness, firm, can reflect multi-level brown yellow color, black. Deep and light greens permeate the inside, making it beautiful and manageable. In order to achieve the color uniform naturally. Bronze thermal coloring technology has strict requirements on the surface smoothness of copper sculpture. The second is the grasp of the heat, there is a very difficult one. Different colors have different requirements for temperature. If it is too low, it will not reach the ideal color standard. If it is too high, it will burn the surface color… The color of every second is changing at any time. Broiling while depends on the aesthetic judgment of the operator worker at what second to stop to achieve the desired effect. Also to temperature control. Aongking’s workers can control broiling very well during the past 30 years.

coloring formula of bronze bull head sculpture
small size bull wall street sculpture
bull wall street for sale
wall street bull statue

In conclusion, a fine patina sculpture coloring formula can withstand the test of time. For example, cultural relics unearthed for thousands of years. The color is still distinct, though not so bright and colorful. But it will not fade for a long time. This should be worth learning from our ancestors. Follow nature, don’t rush into an advantage. Is the natural law that Aongking should follow in the sculpture profession.

Beautiful & fine sculpture colors, like the eyes of the bronze bull head sculpture, flashing. Different patina sculpture color is interlaced texture, like brocade belt winding.

Full of change, natural flow, brilliant color. There is the wall street bull for sale. Like Indomitable flames. To be meek in the hands of the Aongking artist. You can see a musket in his left hand and a watering can in his right. Fluids flow naturally, stack up, interweave. The color is colorful and mottled. Asking Aongking