This standard targets the cold-set web offset printing process, establishing unified technical requirements and testing methods for the color and transparency of four-color printing inks, aiming to ensure consistency and predictability in the color performance of printed materials. Its core lies in precisely evaluating the chromaticity characteristics and light transmittance of inks by preparing printed samples under specified conditions using specialized equipment, thereby providing a critical technical basis for color control in ink production and printing enterprises. In practical testing, it primarily relies on two key types of instruments: first, precision printability testers, used to prepare standardized ink samples under controlled conditions; and second, color measurement instruments such as spectrophotometers, used to objectively quantify the color data of the samples, ensuring the accuracy and repeatability of test results.