碱液浸泡法。将被腐蚀的铜雕佛像置于倍半碳酸钠溶液中浸泡，使铜的氯化物逐渐转换为稳定的铜的碳酸盐，铜雕的氯离子被置换出来转入浸液中。浸液需定时更换，直至浸液中无氯离子出现为止。
Soaking in alkali solution. The corroded copper Buddha statue is immersed in sodium sesquicarbonate solution, so that the chloride of copper is gradually converted into stable copper carbonate, and the chloride ion of the copper statue is replaced and transferred into the immersion solution. The leaching solution should be replaced regularly until chloride-free ions appear in the leaching solution.
随后将器物用蒸馏水反复清洗，除去碱液，干燥后封护。碱溶液仅把氯化物提取出来,保留着色彩斑斓的孔雀石等腐蚀层,不损害铜雕的原貌。此法缺点是置换反应时间长;另外氯化物不仅附在锈层表面，而且已渗入器物腐蚀结壳的深部，难以置换彻底。
Subsequently, the utensils were repeatedly cleaned with distilled water to remove the lye and sealed after drying. Alkali solution only extracts chloride and retains colorful corrosive layers such as malachite, without damaging the original appearance of copper carvings. The disadvantage of this method is that the replacement reaction time is long; moreover, chloride not only attaches to the surface of the rust layer, but also penetrates into the deep part of the corrosion crust of the apparatus, which makes it difficult to replace completely.