阐述了专色油墨的干退密度对颜色的影响，对不同专色油墨进行了实验，记录并分析了实验数据，得到了不同专色油墨的主密度、BK值和色差变化情况，找到了专色油墨干退密度和颜色的变化关系，为生产时对专色油墨的控制提供基础。

The effect of spot-color ink dry density on colors was introduced. Different spot-color inks were tested and the data were recorded and analyzed. The main density, BK value, and change of color difference of different spot-color inks were obtained. The relation between dry fading density of spot-color ink and color change was found. The purpose was to provide reference for control of spot-color ink in production.