According to " New Printing Dictionary " ( issued by Japan Printing Society),' " Printing" is a technique to make a plate according to the original, to charge inks on the plate, to impress and transfer to paper or other substances, and to get multi-copies. Especially, from the color reproduction point of view, it is necessary to select adequate inks for the kind of original and for the type of plate which is made according to the original. There are five methods classified for color reproduction in printing. In this report, I describe mainly that 00 Process color inks which reproduce color. 0 Color matching, especially C.C.M. ( Computer Color Matching ) which is applied color reproduction with special mixed colors. Regarding to the process color inks ( blue and magenta ), I mention the history of establishment and the present state, and the difference of pigments which is used. Concerning CCM, I describe the principle, the points of problem, the introducing effect, the accuracy as the system.