First, pour a small amount of coconut oil over a soft, clean cloth and gently wipe it. This will help to hold the sculpture itself in place. Coconut oil is used because the substances contained in the coconut oil itself do not cause damage to the figure. Attention needs to be paid to the discoloration.
It is also important to regularly wipe the sculpture with a soft cloth dampened with distilled water. At the same time, we can also add a little mild soap to the distilled water to clean the dirt. For some corners that can't be wiped clean, we can use a soft bristle brush to deal with them, which can well clean and protect the figure sculpture.
Silver oxide method: silver oxide is used to contact with cuprous oxide to seal the exposed surface of cuprous chloride to achieve the purpose of controlling sculpture corrosion. First, the powdery rust is removed mechanically to expose the grayish-white waxy cuprous chloride. The silver oxide and alcohol are then mixed into a paste, coated on the surface of cuprous chloride, and placed in a humid environment to allow it to function fully to form cuprous oxide and cuprous chloride, which cover the surface of cuprous chloride. Both are stable salts. Repeat this until the object is placed in a high humidity environment and no powdery rust spots appear. This method is suitable for objects with uneven local corrosion and objects with metal crusts.
Benzo** method: benzo** is a heterocyclic compound, which can form a stable complex with copper and its salts, form an insoluble and quite strong transparent protective film on the surface of copper alloy, inhibit and stabilize copper etching diseases, and prevent water vapor and air erosion. Contaminant. Distilled water and organic solvents such as toluene and acetone are used to remove dirt and oil from the surface of the sculpture, and then immersed in benzo**alcohol solvent to penetrate to form a thin film composite protective layer. However, benzo** is easy to sublimate when heated and loses its protective effect. Therefore, a layer of polymer material should be coated on the surface of the copper carving to form a sealing film.
Alkali immersion method: the corroded sculpture is soaked in sodium sesquicarbonate solution, so that the copper chloride is gradually converted into stable copper carbonate, and the chloride ions in the copper sculpture are replaced and transferred to the immersion solution. The immersion solution should be changed regularly until chloride ions are no longer present in the immersion solution. The utensils are then washed several times with distilled water to remove alkali, dried and sealed. The alkaline solution extracts only chloride, retaining colored malachite and other corrosive layers without damaging the original appearance of the bronze sculpture. The disadvantage of this method is the long reaction time of displacement;In addition, chloride not only adheres to the surface of the rust layer, but also penetrates deep into the corroded skin of the utensil, making it difficult to replace it completely.