| 摘要 |
PURPOSE:To correct the image of a silver salt lithographic plate rapidly and exactly, and to obtain a correcting soln. superior in printing resistance of the corrected image, effective after oleophilicness giving treatment, and storable for a long term, by adding iodine or an inorg. iodine compd. CONSTITUTION:A viscosity raising agent, such as carboxymethyl cellulose, is added, when needed, to an aq. soln. of iodine or an inorg. iodine compd. such as KI, NaI, or ZnI2 in order to prevent spreading of a correcting soln. beyond a place necessary for correction. The correction soln. thus prepared may contain dye or pigment when needed, and in addition, glycerin, glycol, or a pH controller. As a result, correction effect does not depend on correction temps., an image can be corrected rapidly and exactly, and the correction soln. is retained effective for correction even after oleophilicness giving treatment. The corrected printing plate is good in printing resistance. |
