| abstract |
(57) [Summary]nUse of lithium as the cation of an anionic dye to enhance the lightfastness of the dye. Said lithium salt of certain anionic dyes as defined in the description; the molar ratio of lithium to sodium is from 1: 4 to 99: 1, and at least 20 mol% of all counterions in the dye are lithium cations. A mixed lithium / sodium salt of an anionic dye; an ink containing the dye; an ink jet printing method using the ink; a substrate printed with the ink; a cartridge for an ink jet printer containing the ink, and a cartridge for the ink jet printer. Included inkjet printers are also claimed. |