DECOLORING ORIGINAL COLOR OF BLEACHED JAPANESE PAPER BY PRINTING TECHNIQUE AND DISPLAYING LETTERED FIGURE

摘要

PURPOSE:To represent lettered figures efficiently and simply without using any coloring agent by printing on the bleached Japanese paper with sodium hypochlorite solution, decoloring the original color of the paper and displaying lettered figures. CONSTITUTION:Sodium hypochlorite solution instead of a coloring agent is used as the concentration is changed suitably in proportion to the grade of decoloring and lettered figures are printed by use of the usual printing method. The original color of the printing paper is decolored on the printed part only and a clear lettered figure is produced by decoloring.