| 摘要 |
An ink composition suitable for printing machine readable indicia on a substrate with an ink jet printing device is disclosed. The disclosed ink composition comprises water, a water soluble resin, a red fluorescent colora nt material mixture comprising C.I. Basic yellow 40 dye, C.I. Basic Red 1 dye, and C.I. Basic Violet 11:1 dye, and a blue colorant material comprising C.I. Acid Blue 9. In the preferred embodiments of the ink composition, the dyes i n the red fluorescent colorant material mixture are present in a weight ratio of approximately 1.12 to 1.36 to 1, respectively, and the weight ratio of the r ed fluorescent colorant material mixture to the blue colorant material is in th e range of about 3.8 to 1 to about 46 to 1.
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