Use dishcloth soaking in solution, and then use dishcloth all the surface relief.
用抹布在溶液里浸泡，然后用抹布擦拭浮雕的全部表面。
youdao
Seed soaking by CwSO4 solution was of no obvious effect.
但硫酸铜溶液浸种没有明显效果。
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