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.
If you wait too long, the top sheet will get wet and start to rip!
To reveal the message, wet the paper and hold it up to the light like before. The entwined fibres are what makes paper strong.
Collectors who encounter two otherwise identical stamps with different watermarks consider each stamp to be a separate identifiable issue. The fibres are then made into a soupy, watery mixture. Audio files can also be watermarked [source: Britannica ].
Faint lines are made by laid wires that run parallel to the axis of the dandy roll, and the bold lines are made by chain wires that run around the circumference to secure the laid wires to the roll from the outside. This embossing is transferred to the pulp fibrescompressing and reducing their thickness in that area.
The wet paper fibres are free to move just enough to thin the paper in those areas.
Click on the color of your choice in the Color box. Over time they have become more complex, so typically they do not need to be wet to be seen when held up to the light.