化学着色是铜雕和铜合金最常用的表面装饰方法。铜雕和铜合金的化学着色与膜的成分和合金的结构有关，铜的着色也与氧化膜的厚度有关。铜及铜复合材料金铸件可以是冷的也可以是热的。冷着色反应慢，成膜牢固。热变色反应，很快薄膜变厚了，但不牢固。防止这种现象的方法是调整稀释剂的浓度。
Chemical coloring is the most commonly used surface decoration method for copper carving and copper alloys. The chemical colouring of copper carving and copper alloy is related to the composition of the film and the structure of the alloy, and the colouring of copper is also related to the thickness of the oxide film. Copper and copper composite gold castings can be cold or hot. Cold coloring reaction is slow and film formation is firm. Thermochromic reaction, soon the film became thicker, but not firm. The way to prevent this phenomenon is to adjust the concentration of diluent.
铜雕的化学着色工艺（铜的冷着色方法之一）：先用砂纸打磨工件表面，再用稀硫酸酸洗，再用金属刷涂，再用清水冲洗稀硫酸溶液，然后烘干铜雕。用硫化钠（晶体）浸泡使铜皮多次变黑，然后自然干燥。做一个简单而庄重的效果。然后，用金属清洁球对工件高点进行擦洗和抛光，以增强工件的分层性。处理后进行蜡防腐或透明喷涂。
Chemical coloring process of copper carving (one of the cold coloring methods of copper): first grinding the surface of the workpiece with sandpaper, then pickling with dilute sulfuric acid, then brushing with metal, then rinsing dilute sulfuric acid solution with clean water, and then drying the copper carving. Soaking with sodium sulfide (crystal) causes the copper skin to blacken several times, and then dries naturally. Make a simple and solemn effect. Then, metal cleaning balls are used to scrub and polish the workpiece's high points to enhance the stratification of the workpiece. Wax anticorrosion or transparent spraying were carried out after treatment.