腐蚀剂在微粒间渗入，把版面腐蚀，造成无数小窝，印出一个柔和纹理。
The etchant penetrates between the fine grains to etch the plate forming countless tiny cells that print in a soft texture.
化学磨版：用强酸或强碱溶液在平版印版的版面上腐蚀，造成幼细微粒表面。
Chemical graining: the lithographic plate surface is etched to produce a fine grain by the application of a strong acid or alkali solution.
水彩色调：用硝酸在钢片或铜片上作腐蚀的蚀刻法。这个技巧是在版面上洒上一层薄薄的树脂粉，加热把它粘附于版面。
Aquatint: it is an etching process on copper or steel by means of nitric acid. in this technique a thin layer of resin dust is sprinkled on the plate and heated to make it adhere.
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