| Watermark is formed in the papermaking process, a "folder" in the paper and not in the paper surface, Ying-ray light and shade when you can clearly see the texture of the graphics, portrait, or text. It is used in the production process of paper pulp fiber density changes in the method and made. When you can see the notes to the light when one of the watermark.
Offset lithography is a very simple means of rubber is about offset (blanket) on the graphic will be printed version delivered to the substrates on the printing, it is also blanket the existence of such a printing method named . In the printing blanket play an irreplaceable role, such as: it can make a good printing surface is not flat, so that the full transfer of ink, which can reduce the plate on the water (water's role in printing see below ) transfer to the substrate and so on. Above is only a general concept, we are usually talking about some offset may be more narrowly, that there are three rollers (plate, blanket, impression) of the lithographic printing in China's south, said the printing of this to offset printing.
China is an offset in the absolute dominance of the printing, the printing speed, print quality is relatively stable
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