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对于脱指后存在带黄褐色的墨斑的镀锡原板进行了电化学和低能电子能谱分析，从而有可能从工艺及材料上找出原因，采取措施，防止这些缺陷发生。
Electrochemical and low-energy electron spectroscopy analysis was performed on the tinned original plate with yellowish brown ink spots after de-fingering, so it is possible to find out the reasons from the process and materials and take measures to prevent these defects from occurring.