Mottle: Spotty or uneven ink application, usually most easily seen and most pronounced in large solid areas. Mottle are caused by poor ink or uneven absorption characteristics in the paper.

• 墨斑:油墨分布不均匀而出现的斑点，通常在大实地的地方，特别显著。是由于油墨品质差，纸张具不均匀的吸收性所引至。