The present invention relates to ink for inkjet printing providing a printed image having improved stability, demonstrated by improved color fastness in time. Said ink comprises at least particles of a synthetic, substantially amorphous aluminosilicate polymer, the synthetic, substantially amorphous aluminosilicate polymer having an average diameter of 1 to 10 nm, wherein the aluminosilicate polymer exhibits an X-ray diffraction pattern that comprises weak peaks at about 2.2 and 3.3 Å.