| 摘要 |
PURPOSE:To obtain the title paper resistant to yellowing and blotting, capable of developing a watermark by printing at a small lot and low cost and useful for preventing the forgery of merchandise bond, securities, etc., by adding a fluorescent brightener for paper-making use to a printing paper or a coating layer of a paper. CONSTITUTION:A fluorescent brightener is added to a paper for watermark printing or to a coating layer of a paper to obtain the objective paper having stable quality. When the paper is printed with a clear ink, the ink is impregnated into the paper or the coating layer to develop a watermark while keeping the surface of the paper or the coating layer from covering or masking. Light transmits through the transparent ink even if a part of the component constituting the transparent ink is colored to yellow color and, accordingly, the yellow visual appearance is eliminated to give a white paper. |
