Color offset printing ink drying process in the process of printing, ink ink just printed ink ink and dry compared, just printed ink printing ink is deep, time interval, imprinted drying, ink will become lighter, this is a problem not ink light fade, discolor, mainly reasons for the formation of ink penetration in the process of drying and oxidation of trabeculectomies discoloration. Cause print fading, discoloration of the factors in many aspects, the performance of the ink of the light, paper, pH, temperature, printing color sequence arrangement is caused by printing fading, discoloration. 

Letterpress printing ink to penetrate dry, just came out from the printing machine printed products, ink layer relatively thick, at this time the permeability and oxidation of trabeculectomies is drying also need to a period of time. Then, the ink inside the material will be a large part of the infiltration of paper fibers inside, after the drying of the film after the oxidation of the ink layer thinner, the color will fade, which is often seen the inevitable phenomenon. The ink control in the original print proofs ink slightly deeper than the degree, when the ink drying will reach the proofs of the ink in the printing ink. 

Ink after printing books and periodicals, books, newspapers, posters, pictures, and other printed products, under the irradiation of sun light, fluorescent lamp, incandescent lamps and other light sources, the ink pigment selective absorption and reflection, in order to present a colorful, colorful color. Shade of the selection of ink, printing color sequence arrangement problems are caused by printing fading, discoloration, when the captain should in printing ink when it is necessary to pay attention to ink, printing products must sample a little deeper, so as to avoid the scrap.