the present invention relates to cyan dye - based inkjet inks having improved permanence when jetted onto porous photo media . the inkjet ink includes a copper phthalocyanine dye having sulfonylamine groups , at least three co - solvents having about 18 % to about 24 % of the composition of the ink by weight , a polymeric dye dispersant having about 0 . 5 % to about 2 . 0 % of the composition of the ink by weight , a penetrant , at least one wetting agent , and water .