PRINTED MATTER AND PRINTING METHOD

• Main Authors: TAKAOKA KAZUCHIYO, HARADA JUNJI, TAWARA YUKIO, MIURA TAKETOSHI
• Format: Patent
• Language: English
• Published: 29.11.1994
• Edition: 5
• Subjects: BOOK COVERS; BOOKBINDING; COLOUR PRINTING; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR; FILES; LINING MACHINES; LOOSE LEAVES; MOVABLE-STRIP WRITING OR READING APPARATUS; PERFORMING OPERATIONS; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; SPECIAL PRINTED MATTER; STAMPS; TRANSPORTING; TYPEWRITERS

PURPOSE:To carry out a colorless printing which can not be recognized with naked eye and make it readable by causing vivid coloring with the use of a coloring solution as required. CONSTITUTION:The printing methods comprises the steps of using a material which colors with a chemical reaction of two components of colorless or light color at least on one side of a printing paper, effecting colorless printing for a part or the whole of the recording content not to be substantially readable with one component of the material, being cured with radioactive rays, wherein the unreadable colorless printed part starts coloring to be readable by coming into contact with the component in the material not used for the colorless printing. In this manner, in printed matters such as studying drills the correct answer can be concealed in use, but by simple carrying out coloring with a coloring solution it can develop cold for giving answer. Thus, vivid and fine coloring is accomplished without causing staining or cobwebbing in the coloring part.