Watermark: A design pressed into the wet paper during papermaking by the dandy roll to indicate quality and provide a means to guard against counterfeit in case of security printing. The watermark is visible when a sheet of paper is help up to the light.

• 水印:在造纸时，由水印辘在湿纸卷上压上，表示品质的图形。它在保密印刷方面，提供一个防止假冒的方法。拿起纸张向光，就看见水印。