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More often, the collector must use a few basic items to get a good look at the watermark.
The word is also used for digital practices that share similarities with physical watermarks.
In one case, overprint on computer-printed output may be used to identify output from an unlicensed trial version of a program.
If these lines are distinct and parallel, and/or there is a watermark, then the paper is termed laid paper.
If the lines appear as a mesh or are indiscernible, and/or there is no watermark, then it is called wove paper. Another type of watermark is called the cylinder mould watermark.
There are two main ways of producing watermarks in paper; the dandy roll process, and the more complex cylinder mould process.
Watermarks vary greatly in their visibility; while some are obvious on casual inspection, others require some study to pick out.
Once dry, the paper may then be rolled again to produce a watermark of even thickness but with varying density.
The resulting watermark is generally much clearer and more detailed than those made by the Dandy Roll process, and as such Cylinder Mould Watermark Paper is the preferred type of watermarked paper for banknotes, passports, motor vehicle titles, and other documents where it is an important anti-counterfeiting measure.
It is a shaded watermark first used in 1848 that incorporates tonal depth and creates a greyscale image.
Instead of using a wire covering for the dandy roll, the shaded watermark is created by areas of relief on the roll's own surface.