aquatint /ˈækwəˌtɪnt/

• 1. 

  N a technique of etching copper with acid to produce an effect resembling the flat tones of wash or watercolour. The tone or tint is obtained by acid (aqua) biting through the pores of a ground that only partially protects the copper 凹铜板腐蚀制版法

• 2. 

  V to etch (a block, etc) in aquatint 用凹铜板腐蚀制版法使(障碍物等)腐蚀