| abstract |
The invention relates to a sheet comprising monochrome or polychrome signs visible only in transmitted light. The sheet consists of at least two jets composed at least partially of cellulose fibers and formed individually by wet process, of a strip intimately integrated and invisible in the finished sheet, said strip comprising monochrome or polychrome marks, visible only in transmitted light in the finished sheet, pre-printed on the web. Application as security paper or watermarked foil. |