In Color Printing, it is an important task for technicians to arrange the printing sequence reasonably. Improper arrangement of color sequence may lead to color deviation, color mixing and reverse overprinting. Let's talk about the color sequence principle. 1. Arrange the colors according to the content and characteristics of the original manuscript. Printing is a means of expressing the layout of graphic design, but also, each color reflects the emotional component is different. Therefore, the arrangement of color sequence must first consider the content and characteristics of the original manuscript. Editors in the design of graphic format, often have chosen a good layout color tone. This tone represents the overall feeling of the whole tone, becoming the dominant color in printing. In terms of color, red, orange, yellow as the tone is called warm; green, blue as the tone is called cold. As a result of the covering power of the ink, generally to warm the main black, green, after printing Magenta, yellow; to cool the main first printing Magenta red, after printing Cyan. The color atmosphere of the picture needs to be enhanced by the color that can be placed on the last color printed. 2. Consider the nature of the paper to arrange the color sequence. Poor quality paper, consider its whiteness, smoothness, fiber loose, poor ink absorption, easy to fall off the yellow ink to make up for the defects of the paper. When printing at night, due to the human eye, low brightness of the weak-color ink should not be arranged in the first color printing. The lightness order of ink is: White & LT; Yellow & Lt; Orange & Lt; Green & Lt; Green & Lt; Red & Lt; Blue & Lt; Purple. 3. Arrange the colors according to the transparency of the ink. Transparent good ink, two-color phase overprint, the lower layer of light through the ink layer above, to achieve a better subtractive mixing, showing the right new color. If the yellow ink used is transparent yellow, the Transparency Order of the four inks is: Yellow & GT; Magenta & GT; Cyan & GT; Black. In general, the transparency of the ink first printing, good transparency of the ink after printing. 4. Color Order from the advantage of overprinter. Due to the deformation of the paper and other objective defects, we can overprint requirements of the main color printing in two adjacent color group printing. Such as two-color machine, can be arranged in the same unit to complete a printing, to avoid the paper due to the existence of the paper, such as stretching problems. Large area of the field, can be arranged after the printing, to avoid the transfer of paper in the process of rubbing dirty and other problems. In addition, monochrome machine is in the first color after overprinting the second color, and multi-color machine is wet pressing process, so you should control the ink viscosity and the amount of ink. That is, the arrangement of viscidity large ink first printing, viscidity small ink after printing, which is crucial, otherwise it will cause reverse overprinter. 5. Consider the process factors such as platemaking. When Printing, the angle difference between two adjacent color groups is at least 30, which helps to prevent color deviation and Moire and other defects. 6. Consider color order according to cost. Cheap black, blue ink first printing, HIGH-PRICED MAGENTA, yellow ink after printing.