JazzDot TENBYO D30 For monochrome printing, it was normal that one black color was used, The technique of three primary color plus feature ... in commercial printing ... ww that was established in the 1970s, that is, printing was better than the limit of print expression. It is my gum pigment printing system. 
モノクロームプリントに、ブラック１色というのが、普通だったが、 ３原色プラス特色という、技法は…商業印刷で…１９７０年代には確立されていたｗｗつまり、印刷 
