Peter Mounier , Nov 10, 2008; 10:47 a.m.
Pigment ink contains solids that are suspended in the solution. After some time the solids separate and settle. If you remove the carts and shake them up now and then you will be alright with expired ink. I used to own an Epson 10000, with pure pigments, not the dye/pigment mix that is now Ultrachrome, and I never had a problem, although I routinely used ink that had passed the expiration date.