| abstract |
An ink set comprising a plurality of solid phase change inks is provided. Less than all inks in an ink set, but at least one ink contains an ink vehicle, a pigment and a fluorescent agent, and the remaining other inks contain an ink vehicle and a pigment but the fluorescent agent is Not included. At least a first ink group and a second ink group of the ink set form a combination, and the first and second ink groups of the combination exhibit substantially the same color under ambient light conditions when imaged. The first ink group and the second ink group of the combination contain different amounts of fluorescent agent, and when exposed to activation energy, the fluorescent agent fluoresces into the image by the first ink group. In the color of the formed pattern, a visible change is caused as compared with the second ink group. [Selection figure] None |