Provided is an ink set comprised of a plurality of solid phase change inks, at least one ink but less than all inks of the ink set comprising an ink vehicle, pigment and fluorescence agent and remaining additional inks comprised of an ink vehicle, pigment and free of fluorescence agent, wherein at least a first ink grouping and a second ink grouping of the ink set form a combination, the first and second groupings of the combination exhibiting a substantially same color under ambient light conditions upon image formation, the first ink grouping and the second ink grouping of the combination containing a different amount of the fluorescence agent, wherein upon exposure to activating energy, the fluorescence agent fluoresces to cause a visible change in the color of a pattern formed in an image by the first ink grouping as compared to the second ink grouping.
提供了一种由多种固体相变油墨组成的油墨组,该油墨组中至少一种油墨但少于全部油墨由油墨载体、
颜料和荧光剂组成,其余附加油墨由油墨载体、
颜料和不含荧光剂的
颜料组成,其中该油墨组的至少第一油墨组和第二油墨组形成组合、该组合的第一组和第二组在形成图像时在环境光条件下显示出基本相同的颜色,该组合的第一组油墨和第二组油墨含有不同量的荧光剂,其中在暴露于激活能量时,荧光剂发出荧光,使第一组油墨与第二组油墨相比在图像中形成的图案的颜色发生可见变化。